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Do you overlap roof underlayment?
Underlayment is always installed starting at the lower roof edge, with upper courses overlapping the lower courses, as you see here. So, underlayment on steep-slope roofs should overlap 2 inches.
Can I use roofing nails for underlayment?
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. Underlayment, flashings, and shingles all work together and must be installed in the correct order.
What nails should be used to install the roofing underlayment?
Square cap nails are typically used for fastening felt underlayment and not asphalt shingles. They have a square-shaped head, instead of the more typical circular head you see on other nails. Square cap nails may have a smooth or coiled shank.
Do you nail down roofing felt?
Lay the first piece of felt Use galvanised clout nails to nail the first sheet of felt onto the roof. We’d recommend nailing from the centre of the edge of the sheet and working outwards. Leave about 5cm between each nail, and ensure the sheet is pulled tight and sitting in line with the roof.
Should I use 15 or 30 lb felt?
If your roof does not have a steep pitch, you can use #15. This weight of felt is a good economic choice if you have a standard roof. But if your roof has a steep pitch, #30 is a better option because it is thicker and tears less during installation. With #30 you get a thicker layer of underlayment and protection.
Is it OK to staple roof underlayment?
Many roofers will tell you that staples are fine for installing the synthetic underlayment. With staples or plain roofing nails, the heads can sometimes tear right through the underlayment. However, depending on local roofing and fire codes, it may be appropriate to secure synthetic underlayments with staples.
Which way up does roofing felt go?
It has to go rougher side up, but there is no specific top or bottom. Make sure the felt placed higher up overlaps the lower piece.
Can roofing nails be too long?
Yes, they can. If they are too long, they will protrude through the sheathing at the roof overhang and be visible.
Do you underlayment nails?
Lay the underlayment down perpendicular to the floor joists. For example, ¼-inch underlayment calls for 3d ring-shank nails every 3 inches along the edge and every 6 inches within the field of the underlayment. When nailing underlayment, don’t think that longer nails are better.
What goes on first drip edge or felt?
The best way is to install the roof drip edge only along the eaves first, then place ice-and-water barrier (in the snowbelt) or felt paper (underlayment) over the drip edge. This lets any water that gets on the roof run down the underlayment and over the drip edge.
Does roofing felt need to be glued?
The reason you should use adhesive sparingly is because the bitumen in the shed felt will expand in warm weather and it will contract in cold weather. Not using too much adhesive allows it some give, which prevents it from tearing or cracking.
Do you overlap roofing felt?
Remember to leave a 2″ overlap. Drive about five nails in the top right-hand corner and roll out the felt about halfway (perhaps 25 feet) across the roof. Stand on the first course of felt and work with the second course of felt above you. It is not necessary to completely nail the top edge of the course.
What nails do you use for roofing felt?
Galvanised nails can be used in a wide range of applications, but are most commonly used in the installation of asphalt shingles and felt on outbuildings, sheds and more – wherever adverse weather conditions are common, galvanised nails are a good choice.
Do you need underlay for torch on felt?
While roofing felt isn’t the cheapest, it’s one of the most effective systems. The torch-on felt solution relies on a three-layer system, which will require two levels of underlay underneath the cap sheet.
Is synthetic underlayment better than felt?
With that in mind, synthetic underlayment is more durable than felt underlayment. Felt underlayment is much more prone to rip from high winds and during the installation process. Synthetic underlayment also holds nails better and repels water instead of absorbing it.
Which side of tar paper goes down?
When laying sheets of tar paper, always lay the sticky, glossy side down. Tar paper’s two sides are noticeably different. One side is somewhat sticky, though don’t expect it to leave a glue-like residue on your hands. The other side is smooth like paper, and typically contains lettering and line markings.
When should 30lb felt be used?
Roof Slope In the case of roofs with a steeper slope, you should always opt for 30-pound felt instead of 15-pound. This is essential due to its increased slip protection and resistance to tearing. If you opt for thinner felt on a steep roof, it is more likely to rip.
Does underlayment go over drip edge?
Does Drip Edge Go Over or Under Felt? According to most building codes and manufacturer recommendations, the drip edge should be installed beneath the underlayment along the eaves of the roof. But over the underlayment along the rake edges of the roof.
