Posts Tagged ‘overlapping’

Grasscloth Engineering and Logistics – Technical Details Post

August 21, 2022
Grasscloth is a natural material that cannot be matched from strip to strip, so all the seams will be visible . In addition, there is usually a slight but noticeable color difference between strips / panels (called shading or paneling ) . So it’s important to plot the layout of the strips to give the most visually pleasing overall look. Usually this means balancing the width of strips so they are all equal , at least on the same wall . We call this engineering .
This wall presented particular challenges , due to the widths of the elements. Grasscloth comes 36″ wide . You can use your straightedge and a sharp razor blade and trim it down to any width you want.
The width of both the large wall spaces to the right and left of the bank of windows was 34.” The width of each window was about 35.” The width of the two spaces in between the windows was 7.”
So you’d think I could trim my panels on either side of the windows, and then over the windows, to about 34″-36″ – give or take a few inches (or fractions thereof).
But that would leave me with two 7″ wide strips between these 35″ panels. Although the look would be uniform and mirror-image from the center outward, moving from right to left you’d have: 35,” 35″, 7,” 35,” 7,” 35,” 35,” … those 7″ breaks were just not going to look right.
One option was to determine the width of the wall (189″) and make each strip an equal width. This worked out to six strips, each at 31.5″ Not good, because this would mean a seam down either far side. And since those sides were 34″ wide, that would mean a 31.5″ wide strip and a strip 2.5″ wide. Not attractive at all, and it would use up an extra strip of wallpaper.
This six strips @ 31.5″ wide scenario might also land with a seam smack in the middle of those 7″ wide interludes in between the windows. Not attractive at all.
So I decided to make the two outer strips 35″ wide. That left 119″ of wall space above the windows to be covered with wallpaper. Do some math and you get four panels of 29.75″ wide. This gave a balanced and uniform look to the area over the windows, and also prevented seams from landing between the windows.
Moving right to left, I cut and hung the full length outer strip first. Then I cut and hung the strip over the window on the right. Then I measured to find the centerpoint of the window in the middle. Turns out it was a bit less than 29.75″ away. So I trimmed that next over-window strip accordingly.
Once that was in place, I measured from that center point above the middle window out to where my left full-height panel would fall, 35″ out from the wall. Took the resulting measurement and divided by 2. Lo and behold, each of the next two panels over the window was going to be a bit wider than 30.” No problem. No one (but a paperhanger or maybe an engineer) is going to notice a 1/4″ or even a full 1″ difference in widths between this strips over the windows.
Another thing to point out … it’s important that I took measurements before cutting these strips for this second left-hand section. Because, since grasscloth comes at 36″ (and walls can be wonky), if my strips had been narrower (say, 28″), that last full-height panel on the left might have ended up needing to be 37″ wide – and that wouldn’t work because it only comes 36″ wide – plus you need at least 1/8″ to wrap around the corner.
Luckily I had the flexibility to be able to trim the panels over the windows to any width needed, to accommodate all this.
If you’ve followed all this so far, let me also toss in that we also need to figure how to get paper in between those windows. More on that below.
In this scenario, I’m moving from right to left.
Area beneath the windows needs to be treated in the same way, and preferably with widths that match what’s going on above the windows. In addition, it’s tricky because after you move across 12′ of wall space, the strips above and below the windows are going to twist and torque out of shape, so that last full-length panel on the far left might not butt up perfectly with the last strip under the windows.
The grasscloth is black , and my wallpaper primer is white . It’s common for teeny gaps to appear at the seams . In this case, it’s likely that white wall would peek out from those gaps. So I like to stripe under where the seams will fall with dark (diluted) paint . This takes measuring , plotting , and also a heat gun to get the paint to dry before the wallpaper hits it, to avoid staining. You can do a Search here to read more about this technique .
Now let’s talk about getting wallpaper in between those windows.
As you can see in the photo, if I hang a 30″ wide strip, a whole lot of paper is going to be cut off and thrown away. Also, a whole lot of sticky, pasted paper is going to bump against that window molding and maybe even the window glass. A lot to clean up! And unwieldy, to boot.
My solution was to stop the wallpaper just a little below the tops of the windows. Then I would patch in a 7″ wide strip in between the windows. This is trickier than it sounds, because, if it were a paper wallpaper, I could simply cut along a design motif and overlay the 7″ wide piece. But grasscloth is thick and overlaps don’t look good. Also grass has no design elements , and the reeds of grass don’t necessarily fall perfectly horizontal , and even if you cut everything perfectly true to square , if the window molding is a teeny bit off-plumb , then your edges won’t butt up perfectly.
So that’s a good reason for striping the black paint under where the butt join will occur.
Same thing for the sections under the windows. I measured and positioned the strips so that the top edge (which I had trimmed to be perfectly horizontal) fell between the narrowest part of the windowsill molding, for less visibility.
I admit, instead of butting the two pieces, here I did overlap the 7″ wide strip about 1/4″ onto the piece under the window, right at that narrow junction. It’s only about 3″ wide, and I figured no one is going to be examining it that closely, anyway. This saved me about a half an hour of measuring, trimming, testing, repeat, repeat.
This is my second window interlude, and by this time I had realized that it’s hard to trim stiff grasscloth around intricate moldings precisely . So I used paint to fill in the edges around the window molding, just in case there might be any gaps between the grasscloth and the molding, so you would see black instead of the white molding paint. I did this with a small sponge; if I had used an artist’s brush it would have been a bit neater and tighter to the conforms of the molding. But sometimes you’ve gotta relax and realize that no one’s going to be scrutinizing the insides of moldings below shin-level.
Area over windows finished, with drapes back in place.
Turns out this particular grasscloth is so uniform in color (quite unusual, I will add), that you can’t really see the panels , nor their equal widths , anyway. I’m still glad I took the time to do all this math and trimming.
Area below the windows, done. That last seam on the left bears some explanation, too. Moving across the top of the windows, I measured that that last strip – the full-length strip – would need to be exactly 35″ wide. It butted up nicely to the last strip above the windows.
But, due to twisting , shifting , expansion , unlevel and unplumb walls and ceilings , and other factors, there is a really good chance that that last 35″ wide strip would not butt up perfectly with the last 30″ wide strip under the window . So I planned to splice these last two strips together.
Yeah, the drapes are hanging there, I coulda overlapped the two strips about 1/2″ and the drapes would have covered it. With a thin wallpaper, I probably would have done this. But grasscloth is thick, and an overlap would be visible , and also the adhesive / paste can’t be trusted to adhere as well to grass as it would to paper .
So I plotted for a splice. Instead of trimming my last strip under the window to 30″ (read above), I trimmed it to 32″ wide. That way, when I hung the last full-length strip to the left, which was 35″ wide, it overlapped the piece under the window by a few inches. Then I did a double cut and spliced the two pieces. See below for details about that technique.
Grasscloth is 36″ wide, and this wall area is wider than that. So two strips were needed. This means you’re going to have a seam, and since grasscloth seams are always visible, it looks best to plot to have the seam fall down the center. It uses more wallpaper to do this, but it looks much better than having, for example, a 36″ wide strip next to an 8″ wide strip.
As mentioned above, in case you get thin gaps at the seams, a dark stripe of diluted craft paint under where the seam will fall, will prevent white wall from showing through.
Rounded / bull-nosed edges and corners have been popular in new construction for at least 10 years. I wish they’d go away. They’re very difficult to trim around, and hard for the paper to conform to and adhere to.
It’s very hard to trim around that rounded edge, because the paper is hanging over and blocking your view, because grasscloth is thick and stiff and your fingers can’t feel through it, and because the edges aren’t necessarily true and plumb so a laser level or other level won’t help you much.
I use this little gadget as a trim guide. It’s actually a small section of the same corner bead material that drywallers use when they assemble these walls. Cut to about 1″ long and notched in different places where you might trim along the edge of the wall.
It’s intended that you place your trimming knife in one of the notches and slide the gizmo along the edge and make your cut. I find that awkward and also inaccurate. So I prefer to use the notches as a guide and mark where I plan to trim with a pencil. Since this wallpaper is black, I used this marking pencil from my home sewing kit instead. Chalk might work, but I was afraid it might now wipe off completely.
The pink pencil line was barely visible, but it was enough for me to use a scissors to trim along the grasscloth. I like this better than using a razor blade as I can see better, and also less chance of scoring into the primer or wall. Which raises its own set of issues – do a search here to find previous posts.
Inside view of the trim guide.
Finished arch. Note the four panels of equal width above the arch. And two flanking full-height panels also the same widths.
I was lucky that there was no pattern to match, so I was able to butt my two flanking strips right up to the edge of the bull-nosed corner. No trimming needed! Then I measured the remaining width between these two strips (the area over the arch), divided by four, and cut four strips of equal widths.
I hung the two on the left, and then one on the far right. This left one strip still to be positioned to the right of center. So the pieces are going to meet over the arch, rather than the last strip falling in a corner.
Same as the last strip under the window (discussed above), it’s really difficult to get your last piece to fit in here perfectly. I’ve done it, but it takes a lot of measuring, trimming, testing, retrimming, and often starting all over again.
So I did a double-cut / splice.
A double cut involves cutting each strip an inch or so wider than it should be, and overlapping the two. Then you take a straight edge and sharp razor blade and cut through both layers. This handy tool is a wonderful non-slip guide for this process. It was invented by an installer colleague in the Wallcovering Installers Association ( WIA ) and she has them fabricated in various lengths (along with other cool tools ) and sells them on-line. Contact me if you’re interested.
Anyway, it takes a lot of strength to cut through two layers of grasscloth, so somewhat difficult for lil’ ol’ me.
You also want to be sure to not cut / score into the wall, because the tension of drying wallpaper can tug at the wall and cause it to actually come apart, leaving an open seam that’s difficult to repair.
So you’ve got to put some padding under the wall where the cut will take place. I use special strips of polystyrene (hard but flexible plastic) to pad the wall. Also invented by a colleague in the WIA , who also sells other cool tools and supplies. Contact me if you’re interested.
This black grasscloth was printed on a white substrate. If the seams aren’t absolutely tight, there can be worries about the backing showing through to the front. So sometimes we’ll take a piece of chalk or pastel (never oil pastel or permanent markers because they bleed and stain ) and run it along the edge of the paper – from the back, and taking care to not get chalk on the surface.
I do this frequently with dark papers ( do a search here to see previous posts ) but opted not to do it with this grasscloth. It wasn’t necessary, and might have stained the porous reeds of the grass. It was beneficial, though, to have striped dark paint on the wall under the seams, as mentioned above.
Ugh. Grasscloth comes 36″ wide, and this section of wall is 38″ wide. It’s not visually pleasing, nor is it easy from an installation point of view, to have a 36″ wide strip next to a 2″ wide strip. Or to use scraps and put a 25″ wide strip next to a 13″ wide strip.
So best to plan two strips of equal widths. Two strips, each 19″ wide, with the seam down the middle.
Actually, the strip on the left was 19″ wide, but I trimmed the strip on the right to 21″, because I like the wallpaper to extend 2″ over the top of the door molding. This provides a more stable surface in case of shifting foundation or walls, and less likelihood (knock on wood) of the seam opening up should the house / drywall experience shifting.
Note that design “rules” caution against seams down the middle of spaces. But it would have been more visually distracting (and used up more paper) to have made three strips of each 12.75″ wide. And would have looked even dumber to have used scraps left from other walls and put together two strips of disparate widths.
So the homeowner and I discussed during our initial consultation , and she was happy with the center seam. Once it was all finished, this particular grasscloth was so even in tone that you barely see the seams, anyway. Win-win!
This did use up additional paper, though, as noted in a previous photo above.

Kill Point Over Door, Ridge, More

February 25, 2022
After you’ve hung wallpaper on all the walls in a room, the point where your last strip meets up with the first strip is called the kill point . This virtually always ends up in a pattern mis-match. That’s why you engineer to place it in an inconspicuous place, such as behind a door.
This powder room, though, had no hidden corner or handy door. That meant that I would have a pattern mis-match a full 5′ high, to the left of the toilet you see here. I prefer to have the pattern match in a corner like this. As you can see – it does. I will explain how I accomplished that.
I decided to place the kill point over the door. Even though this space is 2′ high and a mis-match might be noticeable, not many people are looking up over the door, so it’s a better choice than in a 5′ or 9′ long corner.
The dark smudges on the wall in the photo are where I’ve spread paint, to prevent white walls from peeking out, should the dark wallpaper shrink as the paste dries.
Here I’ve positioned the strip on the left. This leaves a gap of about 3″. Once I match the new strip up to the piece on the right, its pattern will not match perfectly with the strip on the left.
Now I’ve positioned both strips, and the one on the right is overlapping the one on the left.
Here’s an idea of what the pattern mis-match will look like. To be honest, it’s not all that bad, with this busy pattern and being up over the door. Still, I thought I could make it look better.
I’m going to do a double cut , which is our installers’ fancy term for a splice. I’m going to cut through the two strips, splicing them together, cutting along the vertical foliage elements, to minimize cut-off motifs and to disguise the splice.
When double cutting on the wall, it’s really important that you slice through the two layers of wallpaper only , and not cut into the primer or wall surface beneath. This is because, if the wall surface becomes scored or compromised, when the wallpaper paste dries and the paper shrinks and pulls taught, it can put tension on the wall surface. If the surface is not intact, it can give way and actually come apart ( delaminate ), resulting in wallpaper that comes away from the wall – and there’s nothing beneath it to paste it back to.
I’ve blogged about this before, so do a Search here to learn more. It’s important!
Anyway, to protect the wall beneath where I will make my splice cut, I’ve placed three layers of scrap wallpaper, to pad the wall. I figure I can cut through the two top layers, but not all five.
Note that three layers of non-woven material have some thickness, and can “throw off” the splice cut and prevent the top two strips from fitting together perfectly. In this case, the paper is flexible enough that I’m not worried about that particular scenario.
The strips are in place, and I’m ready to make my cut. I prefer to use a single-edged razor blade held in my fingers, rather than a blade-holder. What’s most important is that the blade be brand new and spankin’ sharp!
Here I’ve made my cut and am removing excess paper from the right side of the top strip. Look carefully and you can see how my razor blade followed the contours of the vertical foliage design elements.
Here I’ve removed the excess paper from the left edge of the bottom strip. You can see they are poised to fit together nicely.
Before fitting the two strips back together, though, I’m examining the wall surface. Check the photo carefully, and you’ll see that I did, after all, score into the primer. 😦 The surface below is skim-coat that was used to smooth a textured wall – and another potential layer that may come apart when exposed to tension from the drying wallpaper.
Shoulda used a Boggess Strip. https://www.steveboggesspaperhanging.com/lexanpage.htm
One way to prevent the wall from delaminating is to put something over the compromised area, to distribute the tension of the drying paper and take it away from the cut wall. Here I’ve taken a scrap of wallpaper, which is a tough non-woven material, and carefully peeled the printed surface from the white substrate (no pic of that process). Now I have a thin material that I can use to pad the wall.
I’m using the black printed side facing out, in case the spliced strips shrink a little – anything peeping out will be black and not noticeable.
Here is the bit of paper in place, spanning across the cut on the wall.
Now I’ve smoothed the two top strips back into place. Since my double cut followed along the vertical foliage elements as much as possible, and because I cut around the gold flowers to keep them full and round, the pattern looks like it matches up just about perfectly.
But wait! … What’s that lump / ridge under the wallpaper, the full height of the seam? That’s my seam padding! Doesn’t look great.
I’m really surprised at this. The non-woven wallpaper material is thick. But that’s why I pulled the top and bottom layers apart, to make my patch piece thinner. I guess not thin enough. Once dried, this ridge is going to be obvious.
But, to be honest, this is up over a door where no one’s going to be spending much time looking. In addition, once I get my 100 watt light bulb out of there and replace the homeowners’ original, small light fixture, this bump under the wallpaper will be pretty much indiscernable.
Still, that lump was buggin’ me. Another invention from my colleague Steve Bogges to the rescue! Pictured is his seam tape , which was made specifically for this type situation. This is very thin – yet strong – paper tape that is used to bridge cut areas like this, and prevent tension from drying wallpaper from tugging at unstable walls.
The tape has a pre-pasted side (the gloss you see), and feathered edges, to make it less noticeable under wallpaper.
Hard to see, but here I’ve placed the seam tape over the cut wall areas
Now the two top strips have been smoothed back into place. Amazingly, no bump from the seam tape beneath shows. And the pattern mis-match is barely visible, too.
Win-win!
All that’s left to do is to wipe paste off the surface of the wallpaper. This overlapping and splicing does mean that wallpaper paste will get on the surface of the strip underneath. Actually, there is a way to prevent that, and it also involves products from Steve Boggess
But … that’s a blog post for another day …
This pattern is called Peonies and is by Rifle Paper.

” Shrinking ” a Strip to Make for a Good Corner

February 5, 2022
I’m hanging wallpaper moving from right to left. The wallpaper is 21″ wide. The width between my last strip (over the door) and the corner is 19″ wide. This means that my next strip is going to wrap around the corner by 2″.
This is not good. You never want to wrap wallpaper around an inside corner, especially a tiny amount like 2″. Corners are never straight, and thus the wrapped bit will be warped and un-straight. The next strip will never butt up correctly with it, leaving gaps and overlaps. You will also end up with a new strip that is not hanging plumb.
Also, wrapping around corners doesn’t allow for movement in the corner as the temperature changes in the room, or as the house shifts on its foundation.
The goal is to wrap the corner by about 1/16″ – 1/8″, and then overlap the new strip on top of that narrow wrap.

This is how I want my strip to land in the left corner.
Bottom line – if I want my next strip to wrap just 1/8″ around the corner on the left, then it’s going to overlap by 2″ onto the existing strip on the right. If that happens, we’ll lose 2″ of the pattern and have some eye-jarring cut-off pattern motifs.
So, somewhere, I need to “lose” 2″ of paper. Looking at the short seam above this window, I see where I can remove some paper without messing up the pattern too much.
I’ve removed the strip and used my straightedge and a razor blade to slice off 3/4″ of paper.
The blue plastic is there to keep paste off my table, and the shiny thing is a protective plastic strip I use to keep from cutting into the wooden table.
3/4″ removed.
Slid back together, you don’t much notice the very minor pattern mis-match created by the absence of the narrow strip.
This could work on a longer strip as well, depending on the pattern motifs.
Now the left corner is how I want it.
But the right edge of the strip is overlapping 1″ or more over the existing strip over the window. You can see there is a pattern mis-match, not to mention a bump where these two pieces overlap. So I’m going to do a double cut and splice these two strips together.
Splicing means you press hard to cut through both layers of wallpaper. Your blade will probably cut a bit deeper and dig into the wall, scoring the surface. This is bad, because an un-intact surface can give way when wallpaper paste dries and the material shrinks, tugging at the surface. This can actually cause layers of the wall to come apart ( delaminate ), which means the wallpaper will come up at the seam. Do a Search here to learn more.
To prevent this, I’m using a Boggess Strip (a clear, thin, flexible strip of polycarbonate Lexon plastic padding ) to put under where the splice will take place, to protect the wall. You can’t cut through this stuff!
The strip in place.
I’ve smoothed the left strip back into place overlapping the existing strip. Next I’ve used a short straightedge and a sharp (important) new (important) single edged razor blade to slice through both layers of wallpaper. Here I’m removing the top strip of excess cut-off paper.
Now I’ve pulled back part of the strip on the left so I can remove the excess wallpaper on the bottom. Note that the cut is a little uneven in areas, to cut around the leaves in the design.
Removing the Boggess Strip. This does put tension on your wall, so you’ve got to have a good wallpaper primer underneath, applied over a sound surface.
The two strips smoothed back together.
The view from below.
I used a pencil to touch up the edges of the leaves, to make them look more rounded and natural.

The polycarbonate strips are named after the inventor, Steve Boggess, a colleague and fellow member of the Wallcovering Installers Association. Get them here: https://www.steveboggesspaperhanging.com/lexanpage.htm

Eliminating a Vertical to Side-Step Poor Placement

July 14, 2019


Here we are, at the last corner of the room, in what we call the kill point. If I hung this last strip as the pattern normally fell, there would be a white vertical shelf support much closer to the one to the right of it than the pattern designer wanted it to be, presenting a crowded look. Also, a portion of the white vertical shelf support would end up falling down along the left side of that narrow space between the two door frames. I thought that area would look better if it held just books, and no white shelving.

So I decided to eliminate that white shelf support, from both the area above the door and the space next to the door molding. To do that, I took my next strip and used a scissors to cut off the left shelf support. I needed a 6″ wide piece, so I counted how many “books” got me to six inches, then cut off the paper vertically along the right edge of those books. I positioned the piece to fill the space over the door, overlapping the left edge of the new strip onto the right side of the previous strip (the side with the white vertical shelf support).

There were a few little pattern mis-matches, but nothing that anyone would complain about while gazing up from the floor 12′ below. 🙂

Next I cut a strip to fill the narrow space between the two door moldings. That part was easy – but trimming around the decorative woodwork on top of the doors, with precious little space to work (the tops of the door moldings had only 1/4″ gap between them) was tricky and time consuming.

The last photo shows it all finished. I think it looks better without the white vertical shelf support, and it was worth the time it took to make this work.