how do i measure for a new roof?

Question

for my house,

Answer 1

Get the old ladder out and climb on top of the roof. Measure from peak to eve, and multiply that measurement by the horizontal width. That will give you your square footage. Since roofing is based on a square[100 sq. ft} you will come up with what amount of shingles you will need. Be sure you add in any dormer roofs, or protrusions that your roof may have, and add another square of shingles for the peak cap.

Answer 2

When I estimated home construction I calculated the length of the ridge by the longest rafter. I then multiplied that dimenstion by 2. It is correct that you divide the total number of square feet by 100 to get the commonly accepted equivelant of 1 'Square'. 3 budles to a square for 3tab and 4 bundles to a square for architechtural.

Don't worry about hips and valleys or shrinkage. If you use this method, you will have plenty of material for the job.

Add the total length of all ridges. Subrtact 2' times the total number of ridges. This will be how much ridge vent you will need. No vent needed on dormers under 8' in length.

God Bless

Answer 3

Don't forget to add about 10% for waste.