Quick Answer: How Long Should Felt Nails Be?

Can you roof over wet plywood?

A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing.

Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the steam finally escapes..

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 I need to remove old shed felt?

Depending on whether your shed is in a sheltered position or not, you might need to replace the roofing felt as often as every 2-3 years. However, buying good quality felt and doing a good job of fitting it should mean that maintenance will be required much less often.

Which side of felt paper goes down?

Roofing felt has a smooth side and a rough side; the side that needs to face the elements is the rough side. Should the nails go straight through the shed roof and be visible on the inside, from where the felt has been nailed on? No.

What is the best adhesive for roof felt?

EVERBUILD BLACKJACK 904 Bitumen Roof Felt Adhesive is the ultimate cold applied, bitumen-based adhesive used to bond roofing felt to most surfaces metal, concrete, timber and more. It provides an incredible high bond strength which delivers a tough but flexible film that hardens and softens with changing temperatures.

How long should shed felt last?

5 yearsMost standard / premium shed felt is designed with a life expectancy of 5 years in mind. As with all building supplies, there are different grades available – buyer beware! Quality and life expectancy change in relation to the quality, type of fibre and the weight of materials used in manufacture.

Can I felt over old felt?

When felting over any old felt you can use a bitten primer to get a proper fix, some felts are also a 3 layer system allowing them to go over old felt, however if he has quoted for old felt to be removed then that is what he should have done.

Can you’re felt a shed roof over existing felt?

It’s best to tear down to the bare roof deck so you can also check for any decking damage. But you can also add another layer of felt on top of existing. This will add additional thickness to the roof, so be sure that fasteners (nails) are long enough to penetrate both layers.

Why are roofing nails so long?

The lifting force generated by high winds over a roof can pull 3/4″ nails out and peel off large sections of roofing, they used 1 1/4″ or longer to ensure penetration through all the shingle layers, underlayment and deep enough into the sheeting to hold up to this abuse.

Does shed felt need adhesive?

If you do not use too many nails, the bitumen will seal around them. 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.

Should old felt be removed?

It should be removed. They should have inspected the sheathing, check to make sure it had no damage or rot and make sure the sheathing was nailed off properly.

Is self adhesive roofing felt any good?

Self-adhesive roofing felt doesn’t require a gas torch, so it’s a much safer and easier option to install. It also has a life expectancy of around 15 years, so it’s a popular choice with DIYers and professional roofers alike.

How long should shed roof felt last?

30 yearsPro-longing your roof Felt is a traditionally used material on many flat roofs. It is strong and durable, with an expected lifespan in excess of 30 years. However, to make them last as long as possible you must take care of them and be mindful of signs of potential damage.

How Much Should felt overlap?

Always ensure there is at least 5cm of overlap between each sheet, and nail down the felt from the centre outwards as before.

How do you felt a flat roof with cold adhesive?

The sequence of laying a felt roof is:Preparing the roof.Laying the first, nailed, layer of Underlay felt. … Laying the second, bonded, layer of Underlay felt.Installing any gutter drips.Laying the top bonded layer of Top Sheet felt.Installing any verge edge and edging to a vertical wall and flashing.More items…

Can you staple roofing felt?

Staples can be used for tacking it down, but not recommended to hold. When the shingles are installed the felt is not going anywhere. Back in the day all I used was staples and /or roofing nails now plastic tops are the norm.