The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
2 sloping roofs meet.
Photography by tim bies.
The sloped roofs on this modern house coupled with the wood paneling gives the house a very modern look.
Gently bend the flashing using the edge of the lumber until both sides of the flashing match the slope of the two roof pitches.
To let the jacks sit plumb on top of the sleepers we angled the level cuts to the 3 1 2 in 12 pitch of the shed roof setting the circular saw to a 16 degree bevel the degree equivalent of a 3 1 2 in 12 pitch.
The sloped roof on this modern glass farmhouse mimics the look of half of the barn behind it.
Set the 2 by 4 aside.
Nail all the flashings as described before.
Roof pitch designations are comprised of two numbers indicating a ratio.
A 2 12 roof slope is considered low so the roofing materials you would use on a steeper roof may not work.
The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.
Or the colon can replace the slash as in 2 12 or 7 12.
How to install roof flashing where 2 roof valleys meet written.
Maintain a minimum overlap of at least 4 inches.
Measure mark and cut two pieces of 1 by 1.
We measured from the ridge to the sleepers to get the lengths of the jacks and then cut them and fastened them into place.
Also note that each flashing is to overlap its succeeding flashing with the overlap being greater for a greater slope.
That means the roofing material you choose needs to protect the materials underneath to prevent water damage and leaks.
Low pitched roofs aren t able to shed water and snow as easily.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.