Posts Tagged ‘calculate’

Always Buy A Little Extra Wallpaper

September 5, 2021

My pencil is pointing at a chunk of paper that was stuck to the label and got torn off when the package of wallpaper was opened.

To get past this unusable paper, I had to roll off and discard a full pattern repeat – in this case, 24″ – that’s two linear feet. And, multiplied by the width of the wallpaper, that’s more that four and a half square feet of paper lost!

This is a good reminder to not calculate wallpaper rollage by square feet. And to always buy extra – just in case.

Even better – do not order your paper until the paperhanger has measured the space. It’s has to do with more than just square feet.

Another Example of Why to Purchase Extra Wallpaper – Don’t Trust On-Line Calculators!

August 26, 2021

See that 3 1/2″ wide stripe of bare wall to the left of the strip of wallpaper? In order to cover this with wallpaper, I will need to take a full 9′ high strip of 27″ wide paper – that’s more than 20 square feet – and cut off just 4″ from the one side. The rest of that 9′ long strip of wallpaper will most likely go into the trash bin.

This is a good example of why you can’t calculate how many rolls you need to paper a room by figuring up square footage. You simply are not able to use every square foot of paper on that bolt!

On-line calculators don’t take into account the waste factor from matching the pattern, and the pattern repeat, nor trimming at floor and ceiling, or around objects (windows, doors, cabinets). Or situations like in the photo above, where most of the strip will go to waste.

Again – always best to have the wallpaper hanger measure first and calculate how much paper you need before you buy.

1″ X 5′ = 9 sq ft of Lost Paper

July 18, 2021

For all the prospective clients who think they can pull out their calculator and slide rule and then meticulously calculate that they can cover their walls with 186.7 sq ft of wallpaper – WRONG!

Here is a good example of waste, and why you can’t purchase wallpaper based on square feet alone.

Here we are working with a non-woven material that is packaged in 21″ wide x 33′ long.

In the photo, that narrow 1″ wide strip of wall on the left needs to be covered with wallpaper.

That’s 1″ wide x 5′ tall. That comes out to .41 square feet of wallpaper.

Sounds negligible, doesn’t it? But in real life, a whole lot more wallpaper will be called into play – and tossed into the trash – in order to cover this miniscule space.

Although I stockpile all scraps, there is nothing in my remnant pile that is long enough, nor the correct pattern match, to cover this space.

So I must cut a new length from a bolt of wallpaper.

The pattern has a 25″ repeat, so I had to cut off almost this much in order to come up with the correct pattern match. That’s 25″ long x 21″ wide … so already, we are nearly 4 square feet cut off and thrown onto the trash pile.

Now that I have the pattern matched correctly, I need 5 running feet of it to cover the length of wall in the photo. That’s 60″ long x the 21″ wide width of the wallpaper. That calculates to 8.75 square feet of paper.

Of those 8.75 square feet, remember that I need only a 1″ wide strip. As previously mentioned, that comes to .41 square feet.

So, 8.75 sq ft – .41 sq ft = 8.33 sq ft of paper that can’t be used anywhere else, and will be tossed onto the discard pile.

That’s 8.33 sq ft of waste. Considering that the average single roll of wallpaper contains 28 square feet (but in reality, only 22 square feet of useable paper), this leaves you with only 19.75 square feet of useable paper.

In double roll speak, this means a bolt with 56 square feet, which is better calculated at 44 useable square feet, after hanging this one puny 1″ wide strip, you are left with 47.7 sq ft of useable paper – nearly 10 sq ft lost for just one 1″ wide strip!

And this is just the tip of the iceberg. I haven’t even gotten into pattern repeats, trimming at ceiling and floor, going around windows, vaulted ceilings, stairs, multiple drops, expansion when wet with paste, and all sorts of other factors.

Bottom Line: We paperhangers know the ins and outs of this stuff.

And homeowners don’t. Nor do contractors, painters, handymen, nor even engineers. Most of all, NOT engineers. (I love ’em all,,,, but they tend to get bogged down in details, and overlook the grand scale.)

Bottom, Bottom Line: Let the paperhanger measure the space and calculate how much wallpaper to order.

Waste Factor – For All The People Who Order Wallpaper Based on Square Footage

May 17, 2020

To come up with how much to buy, lot of people carefully measure and calculate the square footage of their room, and then divide that by the square footage on a bolt of wallpaper. WRONG!

This does not allow for the “waste factor.”

Wallpaper is not like paint. You can’t grind it up and put it in a bucket and spread every square inch onto your walls. You will lose some – often a lot – to waste.

In the photo above, I have only papered 1/4 of the room. Yet look at my discard pile – all this paper was cut off in order to match the pattern, or to go around a window or door, etc.

By the end of the day, this pile was a whole lot larger.

If you are trying to calculate how much wallpaper to purchase, please click the link to the page on the right “How To Measure For Wallpaper” for more details.