Installing Roof Valley Shingles

Install an underlayment centered in the roof valley.

Installing roof valley shingles.

Be mindful of the proper nailing technique so that your nails always hold the top edge of the course beneath it. Glue the valley end of each shingle with bituminous mastic. Then begin nailing the shingles to the roof working in rows and starting at the edge of the roof. Working your way up and across begin laying your courses.

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. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Do not use a shingle trimmed to less than 25 cm in length to finish a course running into a valley. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

To install asphalt shingles start by installing underlayment and new flashing on the roof. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Nail the shingles 5 cm back from the chalk line. Roof one side of the valley running the shingles across it.

Overlap each metal piece by at least 150 mm 6 and use asphalt plastic cement under each section of overlap. 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. Ensure ice and water protector has been installed along the valley first. 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.

Shingle the other side of the valley the same way. Once you ve done that cut your shingles to size if they re not already. Then starting at the base of the valley center your first piece of flashing in the valley. How to shingle a valley with architectural shingles.

If necessary trim a part off the adjacent shingle in the course to allow a longer portion to be used. 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.