Installing Roof Valley Shingles

Do not use a shingle trimmed to less than 25 cm in length to finish a course running into a valley.

Installing roof valley shingles. Glue the valley end of each shingle with bituminous mastic. If you are looking to install shingles you might want to consider the closed cut valley method it is popular because the two roof planes do not need to be shingled at the same time. Nail the shingles 5 cm back from the chalk line. How to shingle a valley with architectural shingles.

Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. To secure the roof valley flashing nail it down carefully. Shingle the other side of the valley the same way. Working your way up and across begin laying your courses.

Then begin nailing the shingles to the roof working in rows and starting at the edge of the roof. Once you ve done that cut your shingles to size if they re not already. Center a minimum 610 mm 24 wide minimum 28 gauge pre finished galvanized metal valley liner in the valley and fasten with only enough nails to hold it in place nailing at the edges only. To install asphalt shingles start by installing underlayment and new flashing on the roof.

Stop nailing 6 inches from the center. Overlap each metal piece by at least 150 mm 6 and use asphalt plastic cement under each section of overlap. Install an underlayment centered in the roof valley. Then starting at the base of the valley center your first piece of flashing in the valley.

Be mindful of the proper nailing technique so that your nails always hold the top edge of the course beneath it. If necessary trim a part off the adjacent shingle in the course to allow a longer portion to be used. Ensure ice and water protector has been installed along the valley first. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. In general the closed cut valley method implies stretching one side of the shingles beyond the valley while those on the other side are trimmed.