Cut your hole in the timber roof and place a piece of felt (reversed) onto the roof approximately 1000mm x 1000mm and tack in place, centralized and cut away the hole.
Ensure that the felt is all the way to the ridge line, but do not worry about excess at the bottom at this stage.
Starting at the bottom of the roof begin to lay your shingles. When you reach the window lift the felt so that it lays on top of the shingles.
Trim the felt to look neat and tidy at the bottom and contunue up the roof trimming the shingles to lay on top of the felt leaving approximately 50mm gap between the window and the shingles.
Continue up to the ridge running the shingles above the window, trimming again to leave a gap approximately 50mm.
Please note the additional tacks used to secure the shingles are only there as the roof is a sample and would normally be covered by a ridge line felt.
I have reversed the felt as black against the roof frames the window and should your shingles be a different colour then the felt will match any choice made.
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