Roof Nail Size For Underlayment

Slats of wood used for roof sheathing are lumber boards with face widths ranging from 4 to 12 inches.

Roof nail size for underlayment.

The more common roof thickness is 3 4 inch decking. These are 1 25 inches long and can be used for underlayment that ranges up to 1 2 thick. 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.

Only use 1 diameter plastic cap roofing nails. Fasten the field area in the middle of the roll a minimum of 24 o c. Synthetic roofing underlayment roll 74 98. Whether you screw nail or staple your 3 8ths underlayment depends completely upon what flooring product you are planning to put over it.

Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches. Plastic round cap roofing nail 3 000 pack 21 97 grip rite grip rite 1 1 4 in. When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails. 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.

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. If you so happen to have thicker underlayment 3 4 inch or more then use 4d ring shank nails. When nailing shingles proper penetration into the roof deck is essential to ensure the nail and shingle remain secure. 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.

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. 12 x 1 in. On center on both head and end laps. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.

More than 1 layer of roofing not recommended over 3 8 sheathing. These are 1 5 inches long plenty long to drive through that over sized over thick underlayment. In normal wind zones the nails should be driven at 6 0 o c. For slats featuring face widths of 12 inches you will space three nails evenly apart about every 3 inches.