The joint should be sealed with plenty of roofing compound and then the.
How to tie in perpendicular roof addition.
Rather than a single slope a gable roof consists of two slopes that meet at a peak running down the middle of the roof.
Tying in perpendicular to existing roof start tying in a new gable roof perpendicular to the old one by removing old shingles and nailing 2 inch by 6 inch valley boards along the chalk lines you marked.
The roof simply needs to be finished as normal but the shingles will need to be cut at an angle so that they fit snugly up against the original roof.
Connect the roofs at a perpendicular angle that will not create a snow or moisture problem.
The big problem is how we can correct the roof and make it square straight on the new part but still bring it over enough to cover the pie section entry and stairs.
This is a good time to consider roofing the entire house as.
The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
Remove siding from the house where the new roof will attach to expose.
Up from the valley center and cut through the shingles and underlayment.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
When matched to the angle and proportions of other rooflines on the house your gable roof will add visual interest and character to the home making the addition look like an asset that belongs with the house.
Again choosing the easy way out we opted to build blind valleys aka california valleys where one intersecting roof is built on top of the other.
Bore holes with a power drill and 1 2 inch bit through the ledger into the rafters or other sturdy frame elements.
Angles will need to be continuous and not stop abruptly creating valleys in the roof for snow or rain to collect.
Connect a flat roof to a sloped or pitched roof with a ledger board.
Drive 1 2 inch lag.
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We want the roof to be square and the existing lower roof to tie in below the new roof line since the roof on the existing part is being modified to suit the new part anyhow.
Miter these at the top to fit a ridge board.
To make the blind valleys we attached sleepers to the shed roof locating them.