How To Determine Length Of Roofing Nails

This was the abbreviation for a penny in the uk before decimalization.

How to determine length of roofing nails.

If your decking is less than 3 4 inch then a 1 1 2 inch nail will suffice. You need to measure the length and width of your roof and then multiply the two calculations together to work out the amount of tiles you will need. Nails that are longer than six inches are called pikes and they are seldom used on roofs. 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.

In the united states the length of a nail is designated by it s penny size and is marked with a number the higher the number the longer the nail along with the letter d the d is an abbreviation for denarius a roman coin similar to a penny. Roofing nails roofing nail sizes sheathing 3d box 4d box 5d box 6d box what size roofing nails composition shingles wood shakes wood shingles. The most commonly used roofing nails range from one to two inches in length. Roofing nails should be long enough to penetrate the roofing material and go 19 mm into osb solid wood plywood or non veneer wood decking or through thickness of decking whichever is less.

Always use 1 in 2 5 cm nails. 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. To determine the nail length you should consider the number of layers of shingles shingle thicknesses underlayment and flashings installed on eaves sidewalls and valleys etc. You should then add a small percentage between 5 and 10 percent to allow for overlapping of tiles.

If you need bigger nails including pikes you may need to place a special order at the hardware store. The one to two inch roofing nails are suitable for most types of roof shingles. In order to work out how many nails you need for your roofing project it is best to first calculate the entire roof and work backwards. This amounts to an average of 320.

Inquire at the hardware store regarding the amount of underlayment nails required. The nails should be 12 inches 30 cm apart along the edges and 24 inches 61 cm apart in the middle of the underlayment strip. The length and width multiplied will equal the total square footage of your roof. The nails should be long enough to go 3 4 inch 1 9 cm into the roof.