Roofing underlayment is important , but not percent necessary. If the top layer of your roofing material springs a leak, a roof underlayment keeps your roof decking dry and safe. Without a roofing underlayment , rain and other bad weather can seep into your roof deck and cause serious problems like rot, mildew, and mold.
However, if you want the safest, most water-resistant roof or to extend the lifespan of your roof, be sure to include the underlayment in the installation. There are three main types of roof underlayment used under roof materials:. Asphalt-saturated felt and synthetic underlayment are water-resistant.
Rubberized asphalt underlayment is waterproof. Asphalt-saturated felt was the go-to roofing underlayment until about 15 years ago, though it is still a great shingle underlayment. Typically, this underlayment has a basemat, or a flexible base layer, saturated with asphalt for water resistance.
It is applied all across the entire roof deck, and depending on the local weather, a water waterproof underlayment may be recommended by your roofing contractor. The advantage of this type of underlayment is that it comes in different thicknesses with varying resistances to damage and weather exposure.
Thirty-pound asphalt-saturated felt, for example, can actually protect the roof longer if exposed to hail, wind, rain, and snow. It can be more difficult to install since it is heavier than other options, it can wrinkle and crack when exposed to cold, and since asphalt-saturated roofing felt underlayment contains volatile compounds, these can dissipate when exposed to heat, causing the underlayment to absorb more moisture and break apart. Synthetic underlayment technically non-bitumen synthetic underlayment is the preferred underlayment of most roofing professionals today.
A synthetic underlayment basemat is saturated in asphalt, and the addition of fiberglass gives it superior tear resistance and stability. Synthetic underlayment is designed for application across the entire roof deck. It is sometimes used with waterproof products. A disadvantage to synthetic underlayment is it tends to be more expensive than asphalt-saturated felt and require more tools and skill to install properly. The image below shows the wind damage caused by an extreme weather event in Hollywood, Maryland on July 19, The inch diameter pine tree in this photo was snapped in half by winds reported to be in excess of 80 miles per hour.
In the background, you can see a church undergoing a roof replacement. This photograph of the church roof below was taken the same day as the one above. Posted in Roofing Guides. What Does Roofing Felt Do? Roofing felt has many different purposes: Roofing felt, installed under roof tiles or roof slates, protects the roof space from being exposed to wind and the ingress of rain and snow, should the roof tiles fail, leak, be damaged or be blown off.
Building regulations mean that a breathable underlay underneath the slates or tiles is now a mandatory requirement to address the issue of condensation within buildings. Roofing felt covers homes where a roof has not yet been fitted, providing a temporary protective layer against weather such as rain and strong winds.
Roofing felt acts as a permeable moisture barrier, allowing the warm, moist air that is generated in the home to escape, whilst preventing moisture from the outside seeping into wooden beams and decking, keeping them robust and secure. The Effects of Condensation Upon Properties Modern houses are built to be energy-efficient, and as a side effect hold warm air released from heating, cooking and breathing trapped inside the house.
What type of roofing felt should be used? Non breathable roofing felt Non breathable roofing felt, such as 1F roofing felt , although in many ways a legacy product, can still be used in certain roofing applications subject to the installation of secondary ventilation. Shop our non-breathable roofing felt Breathable roofing felt Breathable roofing felt is a thin, lightweight material that allows moisture to pass through it in the form of water vapour, which naturally rises and 'pushes' through the membrane.
Shop our breathable roofing felt Water repellant and weather resistant If water gets underneath the roof tiles or slates, it could cause damage to belongings in the loft as well as severe structural damage, leaks, mould, and rot. Where can I find breathable felts and non breathable felts near me? You can view and order both breathable membranes and non breathable felts, as well as a wide range of roofing products including natural slates, man-made slates and our wide range of clay roof tiles and concrete roof tiles in any of our branches listed below or we can deliver nationwide: Dorking, Surrey branch Redhill, Surrey branch Esher, Surrey branch East Grinstead, West Sussex branch.
Related Products. When roof shingles are rated, they are done so with felt underneath. By themselves, your particular shingles may not pass the Class A fire rating. Professional roofing companies choose a base that is a match with your specific shingle. Be sure to ask your roofer about the grade of your shingles and the felt paper they use. ASTM International is standard compliance.
Ever noticed a new home that sits for a week, two, or even three before the roofers arrive to apply the shingles? If there is a lot of rain, snow, ice, or high winds during that period, the wood deck can be damaged. Felt roofing paper offers a layer of protection during this period before the shingles are secured. This extra layer helps shingles lay flat by providing an even surface for the shingles to lay flat.
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