I've used 2x8 rafters on 24" centers and my place is only 20x30. Good news is that they did a section at a time, so the OSB was exposed to fairly light rain/drizzle for about a half hour before peel and stick membrane was installed. Laying a felt roof. A low viscosity, high penetration, cold applied bituminous solution designed to prime and seal porous roof surfaces prior to the application of bituminous materials. Many of the inner components of your roof—such as barriers, OSB boards, and felt— are also sensitive to water … When he begins to loose faith, there is hell to pay following. When considering how to felt a roof torch on felt, the second layer is also an underlay felt but is bonded to the first layer with adhesive. Before laying 13.6kg felt on a flat roof make sure the plywood base is in good condition. Do not shingle over wet or damp roof sheathing or damp felt paper. Rolls of felt are not often available as wide as a shed roof, so you will need to cut more than one pice to cover the whole roof. Written by Larry Bohan on 15 May 2018. Blisters or bumps in asphalt roof. In Houston you might … Step 5 Repeat steps 2 through 4 with a second layer of tar paper, for maximum coverage. The trapped moisture cannot evaporate when the sun heats the shingle. Remove excess felt, nails, and adhesive before replacing the felt on your flat roof. When laying this layer, avoid having joints in the felt at the same place as on the first layer, so it can be best to start sizing with a half width of a roll to achieve this. An additional option is to perform an infrared scan of the roof assembly. An infrared roof inspection will help identify anomalies and areas of potentially trapped moisture. What is Torch-on Roofing Felt. The first layer to fix to the roof is the underlay and should be laid at right angles to the direction of the fall of the roof. Begin laying out your roofing felt by starting at one corner. Do not use felt as a temporary protection against rain: If it gets wet it will wrinkle, making it harder to shingle. There are some wet-applied sealants for flat roof situations, but I've never used them myself. 1 laying shingle over wet deck or felt will not cause shingle to blister (blistering of shingle is a manufacting defect) 2 if you lay shingles over winking felt your shingle willnot lay down unless you pulled the felt tited as you nailed it then most of the time 3 if you hand seal and used to … Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. I was going to remove the existing felt roofing prior to glueing the EPDM to the wood but removing the felt has proved an impossible task as the felt had been laid with hot tar. Laying a felt roof is hard manual work which once started needs to be finished, you cannot leave it halfway through to come back to in a couple of weeks. If there are nail dimple holes, you can use bitumen filler to level it off first, so there's less pooling of water to seep in. When working with a helper, expect to spend several hours to install drip edge, WSU, and roofing felt on a medium-sized roof. If you are thinking about refelting a roof or replacing a layer of felt, take care that you use the appropriate type of roof felt and adhesive. Re: Soaking Wet Roof Decking When we are going to felt and roof a wet deck, we break out the brush torch and try to dry the deck somewhat. The felt roof underlay is secured by nailing direct to the rafters and then held by the battens which will be fitted to secure the tiles or slates too. This moisture can lead to mold and mildew forming underneath the shingles. I am re-roofing my leaky garage roof. The felt, if it is wet when the shingles are applied, will invariably bulge and crease if not outright tear under the workers feet (or bulge/crease just by being wet in many cases) which can also reflect through to the shingle surface as bulges and waves. Once you get to the edge of the roof, or when the roll runs out, start nailing the felt. Here at Roofing Superstore, we have a number of breathable roof membranes available for your latest roofing project, from Tyvek Supro breather membrane to Cromar’s breathable membrane, TLX breathable pitched roofing felt, Klober Permo and more.. ... Is it ok for a roof contractor to lay paper tar nd shingles on a damp roof ? A felt roof could mean the now very old pour and roll type felts, or the newer and much better Torch-on roofing felts. Conclusions on felting a flat roof. Torch-on roofing, or torch-down roofing as it is also known, is a flat roof covering solution that involves three layers of modified bitumen (felt) melt-welded onto the roof surface and each other with the use of a blowtorch to create an impenetrable, waterproof seal. However, it is commonly thought amongst roofing experts that torch-on felt can last beyond 30 years in many cases. The biggest concern with exposed building paper (felt) on the roof is the customer/home owner. If you've nailed the felt it'll like as not be there that it is leaking. For example: It repels water Wind-driven rain or snow can trap water under your shingles, putting your roof deck and inner residence at risk of moisture damage, leaks, rot and mold. The idea is to make sure water that falls on the roof drips down from paper to paper and off the roof rather than up under the tar paper, potentially damaging the roof's wooden structure. Depending on the manufacturer, the minimum guarantee you will receive is 10 years. Make sure that any section of felt you cut has about 50mm extra on each edge to allow the joints to be sealed well. Of course, this is as long as the roof is well maintained. Unroll the felt 30 minutes before starting the job. Install a course along the snapped line, then install succeeding courses using a guide or a snapped line. Roof replacement is expensive. Removal and replacement of wet roof insulation will maintain R-values, improve energy efficiency, extend roof life, and prevent pre-mature degradation of roof substrates. We've been advised by a highly regarded local roofing contractor that having these insulated concrete slabs on top of the roof is an old fashioned design and a bad idea, because they keep the felt permanently wet, encouraging moss to grow and the felt to rot. Roll it out along the edge, keeping a three-inch overhang. Best paint on waterproofer – Emergency roof repair in a tin. Do not attempt to lay roof felt in cold or wet weather. I know you can't get all of the moisture out of the ply but you can get a huge head start. The roof in this image had been left well beyond it’s serviceable life and to the point of total failure, leaving a substantially sized building extremely vulnerable. I've used 5/8's osb and then I put #30 felt on it. When the felt gets wet it will crinkle up and not lay flat which may not be noticed if you have a thick comp shingle (30 year+). Laying and Fitting Roofing Underlay. The durability of felt is one of its main plus points. If you plan to stay in the home for the next 10 years, do not shingle over older shingles. It may seem like a tedious task but felting a shed roof is actually straightforward if you are know-how. In fact, there are a number of important ways roofing felt not only protects your roof, but also your residence. If you need to temporarily protect a roof, cover it with plastic sheeting or a tarp. Again, these don’t mean the roof is condemned, unless they burst and become hollow, or sit below lying water (ponding). Step 3 - Secure Felt To Roof Are caused by moisture trapped underneath the roof surface which then expands with the heat and lifts the felt away from the roof. I have purchased one sheet of EPDM to cover the whole roof (30ft x 13ft). Cromar Bitumen Primer For Torch On Roofing Felt 1 litre / 5 litre / 25 litre. If the existing roof has wavy horizontal lines, you can take out the waves by snapping a horizontal line 1/2 inch below the shingle bottoms of one course. Allow any wet … Work along the roof taking out any excess slack in the felt, but do not pull it tight; a slight sag between rafters is ideal as it will allow any water to drain down the felt. Laying the New Felt (ridged roof) Unroll your new sheet of felt and measure out the length of the roof. Laying down felt on a flat roof is an easy and effective way to improve the strength and durability of an outdoor structure like a garage or shed. Torch-on Bitumen Felt. Upgrading this roof thermally will require a new layer of insulation in the region of 120 mm which will impact on abutment details. Fasten drip edge on eaves with galvanized nails and a hammer, about 12 inches apart, before laying roof felt. It could be feasible to apply a layer on top. When the home inspector checked the roof, he found that the new shingles were installed without a layer of felt. If the sheathing or wood is wet during the time of installation, it can trap moisture inside of your roof, leading to mold, rot, or other severe problems. Common problems with these roofs are… Cracks, puncture holes (impact) or splits in the felt; Lifting or badly stuck joints in the felt It started raining during the install. Lay the roll of roofing felt on the corner and let it overhang by three inches on each side. 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