Roofing Nail Length Second Layer

However where the roof deck is less than three fourths of an inch thick the nail should be long enough to penetrate fully and extend at least one eighth of an inch through the roof deck.

Roofing nail length second layer.

If you are putting a layer of asphalt shingles over an existing layer of asphalt shingles on to a 3 4 inch deck or a plank deck then you should be using 1 1 2 inch nails. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Select a length of roofing nails that penetrates completely through the new layer of shingles existing layer and the wood roof deck. Apply the shingles to all roof planes ending a row of shingles at the top of the plane which is the ridge or peak and cut to follow the profile of any outside corners.

Use 1 5 or 1 75 inch roofing nails. Nails of the proper length should penetrate three fourths of an inch into the roof deck. More than 1 layer of roofing not recommended over 3 8 sheathing. Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves then nail it into place.

To determine the nail length you should consider the number of layers of shingles shingle thicknesses underlayment and flashings installed on eaves. Use galvanized roofing nails long enough to fully penetrate the sheathing typically 1 1 2 inches for a second roof and 1 3 4 inches for a third. Nesting each new row below an existing one keeps the new nails 2 inches below the existing which will help minimize any splitting of the sheathing. 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.

If your decking is less than 3 4 inch then a 1 1 2 inch nail will suffice. The length of each nail must be a minimum of 1 inches long and for roof overs atlas recommends a nail length of at least 2 inches.