Roof Nail Size For Underlayment

When nailing shingles proper penetration into the roof deck is essential to ensure the nail and shingle remain secure.

Roof nail size for underlayment.

The international building code requires that roofing nails have a minimum 12 gauge shank and a 3 8 inch diameter head. Smooth galvanized coil roofing nails 7200 pack 26 98 gaf feltbuster 1000 sq. 12 x 1 in. These are 1 25 inches long and can be used for underlayment that ranges up to 1 2 thick.

These are 1 5 inches long plenty long to drive through that over sized over thick underlayment. Wood shakes minimum 3 4 sheathing wood shakes nail type minimum length 18 straight split 5d box 1 3 4 18 and 24 handsplit and resawn 6d box 2. Slats of wood used for roof sheathing are lumber boards with face widths ranging from 4 to 12 inches. Plastic round cap roofing nail 3 000 pack 21 97 grip rite grip rite 1 1 4 in.

Fasten the field area in the middle of the roll a minimum of 24 o c. On center on both head and end laps. If you so happen to have thicker underlayment 3 4 inch or more then use 4d ring shank nails. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.

For the lower portion of the roof especially the part that overhangs the eaves and is susceptible to ice dams it is a good idea to apply self stick waterproof shingle underlayment wsu also called ice guard. Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches. More than 1 layer of roofing not recommended over 3 8 sheathing. In normal wind zones.

For all owens corning shingles roofing nails should penetrate into the wood deck by a minimum of inch or completely through the roof deck by a minimum of 1 8 inch. Synthetic roofing underlayment roll 74 98. Nail down squarely 90 degrees into the deck to secure caps flush to the underlayment. In normal wind zones the nails should be driven at 6 0 o c.

Generally you ll need to place two nails at each location where it makes contact with a roof truss. Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive. Whether you screw nail or staple your 3 8ths underlayment depends completely upon what flooring product you are planning to put over it. The more common roof thickness is 3 4 inch decking.