With every insulation material and project, there are always challenges to consider. Spray foam insulation is installed to cover the entire attic floor and the juncture of the attic floor, the top plates, and the base of the baffles. It allows air to flow through it. Often light-weight foam can be applied over an existing roof-membrane (i.e. The spray foam expands on contact, filling up the space where it begins working immediately. If roof is low over attic eaves, completely fill those areas with spray foam to baffles to ensure code-minimum or higher insulation levels over the top plates. Since a spray foam system consists of spray foam, coating, and granules, after 10-20 years, some of the coating and granules will naturally wear away. Don't we need to allow the air above the ceiling but below the roof to have a way to escape? I want to build the best structure possible. We live in the downstairs area(2400 square feet) that has 10" ceilings in the rooms. That sounds rather counterproductive. But water can. Similarly, not everyone can afford to spray nearly 10 in. Since the foil radiant barrier is the first line of defense against radiant heat and the foam is the 2 nd line of defense against conductive heat, combining the two would result in the ultimate reduction of heat flow.. Double-Deck Roof System - Two decks with two layers of radiant barrier make a ventilated skin over full foam sealed attic. Open cell means that the tiny foam cells aren’t completely closed. Spray foam can be found in … The 1-1/2" x 10' long for used 7/8" or lower rib heights, with a single layer self adhesive ridge vent and easy installation. when installed over wood framing that has 28 to 35 per cent moisture content) took approximately 35 days to dry less than 19 per cent moisture content compared to 8.5 days to dry with no foam attached. Reduced ponding due to unique roof designs and various application thicknesses to create a positive slope and improve drainage. If vapor comes through the slab and I have a sealed spray foam envelope my thoughts are I would be creating a haven for mold. Spray foam insulation is versatile and can be used to insulate your roof, loft, walls and floor. An aluminum ridge vent has a mushroom-shaped profile combined with a wide flange on both sides that sits on top of the roof shingles. Spray foam is applied directly where it’s needed, ensuring that any ventilation vents are left untouched. The homeowner noticed moisture condensation occurring in the attic and since then, black mold has developed on the OSB board. The rigid foam is cut to be 2 inches wider than the space between rafters, then 1 inch of foam is scored and folded over on either side of the foam, creating standoffs that hold the foam away from the roof sheathing, providing a space for air to flow. Applications: Fits many profiles. To create channels for air circulation, this system includes starter strips for each rafter opening as well as extensions that lengthen the ventilation path to the ridge vent. Polyurethane foam roofs eliminate the need for counter flashing. The code also assumes that the spray foam is applied well enough (when under the roof deck) that no moist air can reach the underside of the roof deck. It has 8" of spray foam insulation on the roof deck and 4" in the wall and crawl space. It also allows any moisture to pass through it. Reduced leakage due to coverage around seams, penetrations, parapet walls, HVAC curves, vents and skylights. This helps ensure that if water does seep beneath your shingles, it will not sit between the spray foam and roof, creating rot. It is strong, durable, fire retardant and UV stable. At year 10-20, a contractor will add more coating and granules. Landfill waste is a significant issue with roofing. That’s why those who use it regularly never buy it without also buying a can of foam solvent.. Sold in metal canisters similar in shape and size to spray foam cans, foam solvent is a liquid designed to chemically dissolve spray foam before it hardens. The foam never gets touched and never loses R-value. This system is also preferred for spray foam insulation in any roof application. The usual application of spray foam is to repair and re-invigorate an existing roof by removing the saturated areas, replacing with like materials, and then spraying foam over top of the entire roof. There are 2 types of spray foam: open cell and closed cell. Spray foam is tough to use neatly, even when you’ve got lots of experience with the stuff. 3. With Patriot Foam & Coatings Roof Foam, you will be able to provide your customers a rigid and durable surface that you can walk on. Open cell spray foam is the most cost-effective way to insulate a metal roof. That way, you get the foam, the radiant barrier, and the ventilation too. Spray Polyurethane Foam Roofing, or spray foam roofing, is a material that’s sprayed as a liquid so it can expand into a foam, creating a solid layer across an existing roof. Install the bottom deck, leaving a 10″ gap from the fascia board to allow air to come in from the soffit vents and flow between the two decks of the roof. We have the capabilities to spray and inject a variety of foam systems to achieve a high R-value while providing both effective vapor and air barriers. A double-sided 48″ barrier is recommended. If spray foam is used, a vent space may still be needed directly under the roof deck. A thick closed-cell polyurethane waterproofing barrier seals the roof against leaks and bonds around roof penetrations such as pipes, vents and edges forming an impenetrable wedge. To create channels for air circulation, this system includes starter strips for each rafter opening as well as extensions that lengthen the ventilation path to the ridge vent. Use a marker to mark the rafters on the foil. It’s terrific because it’s pretty much the same temperature as the rest of the house all the time. I have read about a method whereby you staple the baffles all the way up to the ridge vent and then spray the foam to the underside of the baffles. This eliminates roof venting and creates what is called a hot roof, where the attic space becomes part of the conditioned (heated and cooled) house space. This is not an issue specific to spray foam as much as it is a characteristic of peel and stick membranes. Ridge Closure & Venting Foam, for Metal Roofing, 1-1/2" Hi-Rib Profile for up to 7/8" High Ribs. Use Spray Foam Without Solvent Handy. Open-cell spray foam is breathable. A shingle-over vent is installed over the ridge of a roof and is covered over by asphalt shingle caps that match the surrounding roof shingles. Spray Polyurethane Foam (SPF) is the only roofing material that has no seams. I am planning no soffit vents, roof vents or gable-end vents. Spray foam from Home Logic is an excellent insulation type to choose for the attic. An alternative option is to insulate the rafter bays with a less expensive insulation like fiberglass or cellulose and to control the temperature of the roof sheathing with rigid foam onthe exterior. What I am concerned most about is they all say I must block off and seal over the soffit vents and ridge vents to create a sealed envelope. The primary risks are rainwater leaks, condensation from diffusion, air leakage, and built-in construction moisture. Spray foam insulation, also called spray foam or spray polyurethane foam (SPF), is an alternative to traditional building insulation. in Spray Foam Homes Spray foam insulation has been increasing in popularity over the last several years due to : •Becoming more affordable • Significant long-term energy savings Sealing restricts air movement through the building envelope. Spray foam can prove something of double-edged sword where costs are concerned, according to RLC Engineering. With foam applied to the underside of the deck, some builders create a vent space over the roof deck, with and air space or breathable underlayment. So spray foam isn't my first choice but I'd certainly take it over batt insulation in a home. This system is also preferred for spray foam insulation in any roof application. Expanding insulating foam is a product that can be sprayed into small cracks and crevasses which then expands and stops drafts and leaks. I understand that if spray foam is installed on the roof deck, I should take out the old blown in insulation in the floor of the attic. The climate demarcation is a distinction between regions where the monthly average temperature remains above 45 degrees F. throughout the year and where it drops below 45 degrees F. during the year. A spray foam roof can be the last roofing system you’ll ever need on a building. FOAM-TECH creates superior insulation and environmental control solutions by installing safe, cost-effective, and environmentally-friendly polyurethane foams. However, any opening over 1/16” can cause the foam to expand onto the roof. I've done this with complete success on … We've got ridge vents in our roof, and he said they'd spray the foam directly on the rafters, covering up the opening to the ridge vent. The spray foam can also serve as the thermal- and vapor-control layers in both new and retrofit construction. Wood has an R-value of about one per inch of thickness. 2. When set into place and sealed with spray foam, the vent baffles are insulated and air-sealed. the original membrane can be re-used), which prevents landfill waste. Where rigid insulation is installed above the roof deck, or air impermeable insulation (spray foam) is installed under the roof deck condensing surface temperatures are said to be controlled. TOM: Yeah. Spray foam is eco-friendly, non-toxic and thermally efficient. Nope, you absolutely do not need to ventilate a spray-foam house and here’s why: because, basically, now that attic is a conditioned space. Foam roofing bonds around roof penetrations such as pipes, vents and edges forming an impenetrable wedge, leaving these penetrations “high and dry.” 4. This approach involves installing closed-cell spray foam directly under the roof surface, right down to the junction of the ceiling and exterior walls. 2. I have no idea if their is a vapor barrier under the cement slab. ridge vents (they run along the peak of a roof to allow for continuous airflow) Even though ridge vents are more expensive and labour-intensive, ... Spray Foam. Among the factors working against the roof system: the insulation fill was about an R-16, there were no intake vents at the eaves, the bath vents were venting into the attic, and the whole house humidifier was adding even more moisture during the winter months. of open- or closed-cell spray foam in their roof or to stack a half-foot of rigid foam on the roof deck. Metal standing seam metal roof. You can purchase expanding foam in a spray can with an attached nozzle for reaching into tight areas. Despite the advantages of using spray foam under the roof deck, there are some potential risks. Spray foam under the roof. A thick (typically 1.5″ thick) closed-cell polyurethane waterproofing barrier seals the roof against leaks. I have a spray-foamed attic. 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