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Properly Install GAF Timberline Shingles

Herrings Roofing and Painting offers much more than siding, painting, and drywall repair. With a wide variety of interior and exterior building materials, we have partnerships with industry-leading brands, such as GAF, one of the countrys most popular shingle brands. With extensive knowledge of GAF shingles, our experts designed a guide to help contractors and home builders in Ashland, Virginia install GAF Timberline roofing shingles, the No.1 selling shingle and part of the GAF Roofing System.

Materials Required for Installation

  • GAF Timberline roofing shingles
  • GAF starter strips
  • GAF Seal-A-Ridge and Timbertex ridge caps
  • Chalk line
  • Razor or utility knife
  • Galvanized roofing nails
  • Hammer or nail gun
  • Speed square
  • Pencil
  • Tape measure
  • Protective metal sheet
  • Appropriate personal protective equipment

Begin Installation with Starter Strips

Starter strips are used as a guide to ensure all shingles are flush and level across the roof. They also provide a line of heat-activated adhesive to ensure the first line of shingles are properly attached. For exposure less than 6, use either Pro-Start or WeatherBlocker starter strips.

  • Measure the width of the starter strips, then subtract the desired width for overhang.
  • Mark the width of the starter strip, minus the overhang, onto the roof at both ends.
  • Mark a straight line on the roof between the two markings made at each end to ensure start strips are straight.
  • GAF starter strips come as a single piece that needs to be cut through the center to create two strips. Cut as many strips as needed for the perimeter of your roof.
  • Place the first starter strip at the lowest corner of your roof. Set it to include the desired overhang on both sides of the corner and flush with your chalk line. The adhesive tar strip should be closer to the drip edge of your roof than the peak of your roof.
  • The first roofing nail should be placed 1.5 to 3 from the beginning side edge of the roof. Space the other three nails (you should have four nails total for each strip) 10 to 12 apart, with the fourth nail leaving a space of 1 to 2 from the ending edge of the strip. This will keep your starter strip more flush with your chalk line than working left to right.
  • Set the second starter strip in-line with the chalk line, directly next to the first strip. Nail as above. Continue to place and nail starter strips along the lowest line of the roof accordingly.
  • At the far end of the roof, cut the final starter strip to allow for the desired overhang. Nail into place.
  • Continue to set starter strips up the sides of the roof using the same overhang, chalk line, and nailing technique.

Pre-Cut GAF Shingles

GAF architectural shingles are designed to be laid in an offset pattern for a more aesthetically pleasing look, plus it improves drainage. For ease of installation, pre-cut the first shingle in each row from the bottom to the top of the roof.

  • Measure shingles at recommended intervals, which is typically 6.
  • Mark each sheet to be cut at 6, 11 or 17 from the rake edge. GAF deck protection, part of the GAF roofing system, comes in a grid pattern that makes it easy to mark these intervals.
  • The lowest row of shingles will begin with a full sheet. Cut the remaining rows at the marked intervals. If the roof is tall enough, you may need to start again with a full sheet midway, and then continue with pre-cut shingles.

Install GAF Shingles

  • Install pre-cut shingles first to ensure the pattern is offset across the whole roof. Start by placing your first full sheet of shingles. This should completely overlay the starter strip at the lowest corner, including the overhang of the drip edge.
  • Nails on GAF shingles go through the black marker strip. Nail the first full sheet in the same way as the starter strip, with one on each side, followed by a nail in the middle, and then at desired intervals or as required by local building codes.
  • Once the first full sheet is in place, install the first pre-cut sheet directly above it. GAF shingles are designed with a white chalk guideline, which is used as a guide for the next row of shingles. The exposed area of the shingles below should be 5 . This ensures appropriate coverage, adhesion and water-tightness. Make sure the bottom of the pre-cut shingle is flush with the white chalk line. Nail into place.
  • Proceed with the rest of your first set of pre-cut shingles. If the roof is large enough that you reach a second full sheet of shingles, do not nail this in place yet.
  • Once the first set of pre-cut shingles is in place, you can proceed to nail full sheets of shingles, flush with the one before it and also with the white chalk guideline, through the black tarline, across the roof. If your roof is a hip roof, cut the ends of the rows at the angle of the hip, leaving a small gap on either side of the hip, then follow the instructions below for installing ridge caps.
  • Once a full set of offset full-sheet shingles is installed, you can proceed with your next set of pre-cut shingles and repeat Step 5 as needed until the roof is completely shingled.
  • As you reach the peak of the roof, cut the final row of shingles so that they are nearly flush with the peak and the final row on the other side. A small gap is allowable. A large gap will cause the ridge cap to bow.
  • Once all shingles are in place, cut the far rake edge, including overhang. A chalk line will give the straightest line and cleanest cut.

Its important to give all GAF shingles enough time for tar lines to heat and cure. Refer to read the manufacturers specifications regarding temperature and time.

Protect Your Investment

Protect your investment and safeguard vulnerable areas of your roof with GAFs proven leak barriers. GAF recommends StormGuard Film-Surfaced Leak Barrier as premium protection for asphalt shingle and metal roofing systems.

A common feature of the protector is the advantage of self-sealing around roofing nails. This feature greatly reduces the possibility of leaks occurring when ice or storms force water underneath the shingles. These protectors should be applied:

  • On eaves, rake edges, overhangs and valleys
  • Vent stacks and chimneys should also have ice and water protector applied beneath their flashing, because often the shingles and or flashing in this area dont overlap completely
  • Any feature that penetrates the roof deck, such as dormers and skylights, can benefit from the application of ice and water protection.
  • Low-slope roofs
  • Areas where the risk of either ice dams or wind-driven rain is severe

The protector needs to be installed directly onto the roof deck after you have placed the drip edge at the eave. Always install the protector before other underlayments, including roof felt. Installation instructions vary by manufacturer, so read the directions provided with the specific product youre using.

Contact us online to find out how our team can help you complete your next residential or commercial roofing project.

Posted by:
October 2, 2019
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