#1723 - 03/29/07 10:31 PM
Figuring Square Footage Of A Roof
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Anonymous
Anonymous
Unregistered
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Well this was my first visit to this site and the page I looked at was the how to page to figure your square footage of your roof. I dont know who wrote that how to or figured that formula but you do not multiply length A x B x 100 to get your square footage heck my doghouse would require 50 square of shingles you might want to edit that page and quit huffin the fumes from the hot tar roof you did last summer.
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#1726 - 04/02/07 05:13 AM
Re: Figuring Square Footage Of A Roof
[Re: Anonymous]
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RemodelingGuy
Super Do It Yourselfer
Registered: 03/02/01
Posts: 914
Loc: Houston, Texas
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http://www.startremodeling.com/measurin.htm
AxB /100
Looks right to me.
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Estimate the amount of shingles you need.
In order to estimate how many shingles you'll need, first you need to estimate the total square footage of your roof's surface. Just measure the length and width of each plane on the roof, including dormers. Then, multiply length x width to get the square footage of each plane. Simply add the square footage of each of the planes together to derive the total square footage of your roof.
For example, this shed roof has one roof plane. Simply measure length (A) x width (B):
A x B = 120' x 100' = 12,000 sq. ft. for the total square footage of the roof.
This gable roof has two planes. So, multiply length (A) x width (B) to get the square footage for each plane, then add the two planes together to derive the total square footage of the roof:
Plane 1: 120' x 100' = 12,000 sq. ft.
Plane 2: 120' x 100' = 12,000 sq. ft.
Plane 1 + Plane 2 = 24,000 sq. ft. for the total square footage of the roof.
Roof surfaces are measured in "squares." A "square" is an area of roof which measures 100 square feet. To determine the number of squares on the gable roof above, for example, simply divide its total of 24,000 square feet by 100. Which means you will need 240 "squares" of shingles to cover it. The most common type of shingle, called a three-tab or strip shingle, is generally packaged three bundles per square.
If this is a new roof, you will also need 240 squares of underlayment (no underlayment is needed if you are applying shingles directly over an existing asphalt roof). Underlayment usually comes in rolls of four squares each, so covering 240 squares would require 60 rolls of underlayment.
Be sure to add 10% to all of your material totals for trim allowance.
Thanks for the health advice tho!
_________________________
Jimmy McDonald http://www.StartRemodeling.comJimmy@StartRemodeling.com http://www.ToxicMoldUSA.comMcMoldMan@ToxicMoldUSA.com Jimmy McDonald ( RemodelingGuy) specifically assumes no legal liability or responsibility for the accuracy, completeness or usefulness of any information or process disclosed. The above further expressly advises that any use of or reliance upon the information and or opinion disclosed is at your risk .
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#1728 - 04/03/07 01:48 AM
Re: Figuring Square Footage Of A Roof
[Re: RemodelingGuy]
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provip
Super Do It Yourselfer
Registered: 03/03/01
Posts: 1153
Loc: Victoria, BC, Canada
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Often you can't get the measurements of each roof plane unless you actually get onto the roof. There may be a number of reasons why you can't or don't want to do this. It's much easier to get the pitch of the roof and often you can tell by just looking at it. Once you have the pitch you can measure the house and depending on the pitch just add a percentage to the house area. ie. for a house with a 4/12 pitch which is by far the most common, you can add 5% and be pretty close to the roof area. so if you have house 40' x 60' and a common gable roof, the roof area will be 2400 sq. ft. + 5% (120)= 2520 sq.ft. In roofing terminology that's 25.2 square. Standard shingles usually come in 3 bundles per square which means theoretically you need 76 bundles, however, there will be waste so you should add on about 10%.
_________________________
Bart Blainey, B.E.R. Consultant/Journeyman Carpenter Building Envelope Specialist Master Renovator provip@prodeck.org http://www.prodeck.orgBarton Blainey (provip) specifically assumes no legal liability or responsibility for the accuracy, completeness or usefulness of any information or process disclosed. The above further expressly advises that any use of or reliance upon the information and or opinion disclosed is at your risk .
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#1730 - 04/03/07 08:17 PM
Re: Figuring Square Footage Of A Roof
[Re: provip]
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Admin5
Super Do It Yourselfer
Registered: 12/31/69
Posts: 28
Loc: n/a
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Glad to see that you are around.
I want to post a bunch of stuff that I get in my email.
Sorry that there are no more notifications for us.
Gonna check in often?
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#1828 - 05/11/07 12:34 PM
Re: Figuring Square Footage Of A Roof
[Re: Admin5]
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Anonymous
Anonymous
Unregistered
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#1863 - 05/19/07 06:58 PM
(NA) Re: Figuring Square Footage Of A Roof
[Re: Anonymous]
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provip
Super Do It Yourselfer
Registered: 03/03/01
Posts: 1153
Loc: Victoria, BC, Canada
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what's going on, so many idiots with no life!!
_________________________
Bart Blainey, B.E.R. Consultant/Journeyman Carpenter Building Envelope Specialist Master Renovator provip@prodeck.org http://www.prodeck.orgBarton Blainey (provip) specifically assumes no legal liability or responsibility for the accuracy, completeness or usefulness of any information or process disclosed. The above further expressly advises that any use of or reliance upon the information and or opinion disclosed is at your risk .
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Moderator: RemodelingGuy, provip
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