With Patriot Foam & Coatings Roof Foam, you will be able to provide your customers a rigid and durable surface that you can walk on. Spray foam is eco-friendly, non-toxic and thermally efficient. Spray foam can prove something of double-edged sword where costs are concerned, according to RLC Engineering. We live in the downstairs area(2400 square feet) that has 10" ceilings in the rooms. 2. Spray foam insulation is versatile and can be used to insulate your roof, loft, walls and floor. 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. Wood has an R-value of about one per inch of thickness. Spray foam from Home Logic is an excellent insulation type to choose for the attic. Add the radiant barrier foil over the roof deck, ensuring that the foil side faces up. 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. Metal standing seam metal roof. There are 2 types of spray foam: open cell and closed cell. It allows air to flow through it. 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. 1. 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. 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 is tough to use neatly, even when you’ve got lots of experience with the stuff. This system is also preferred for spray foam insulation in any roof application. 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. 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. It also allows any moisture to pass through it. A spray foam roof can be the last roofing system you’ll ever need on a building. Add ridge vent closure foam that will reduce wind-blown rain entry through the vent openings Add a taller ridge vent flange along the entire ridge run so that wind blowing rain "up" the roof won't send water over the existing vent flange and into the ridge vent. I have no idea if their is a vapor barrier under the cement slab. A double-sided 48″ barrier is recommended. A thick (typically 1.5″ thick) closed-cell polyurethane waterproofing barrier seals the roof against leaks. When set into place and sealed with spray foam, the vent baffles are insulated and air-sealed. 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.. I am building a workshop 20’x 34′ insulated, heated and cooled. 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. 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. What does that mean for the roof over your head? I've done this with complete success on … The spray foam expands on contact, filling up the space where it begins working immediately. of open- or closed-cell spray foam in their roof or to stack a half-foot of rigid foam on 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. I am planning no soffit vents, roof vents or gable-end vents. 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. 3. That sounds rather counterproductive. Similarly, not everyone can afford to spray nearly 10 in. The spray foam can also serve as the thermal- and vapor-control layers in both new and retrofit construction. 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. 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. 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. I have a spray-foamed attic. This approach involves installing closed-cell spray foam directly under the roof surface, right down to the junction of the ceiling and exterior walls. Foam roofing bonds around roof penetrations such as pipes, vents and edges forming an impenetrable wedge, leaving these penetrations “high and dry.” 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. TOM: Yeah. If spray foam is used, a vent space may still be needed directly under the roof deck. the original membrane can be re-used), which prevents landfill waste. The homeowner noticed moisture condensation occurring in the attic and since then, black mold has developed on the OSB board. This helps ensure that if water does seep beneath your shingles, it will not sit between the spray foam and roof, creating rot. However, any opening over 1/16” can cause the foam to expand onto the roof. 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. Open-cell spray foam is breathable. Don't we need to allow the air above the ceiling but below the roof to have a way to escape? FOAM-TECH creates superior insulation and environmental control solutions by installing safe, cost-effective, and environmentally-friendly polyurethane foams. No spray foam will not rot your roof. Use a marker to mark the rafters on the foil. The foam never gets touched and never loses R-value. 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. This is not an issue specific to spray foam as much as it is a characteristic of peel and stick membranes. The primary risks are rainwater leaks, condensation from diffusion, air leakage, and built-in construction moisture. 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. 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. 1. Zip system for roof sheathing and foam insulation. But water can. It is strong, durable, fire retardant and UV stable. Spray Polyurethane Foam (SPF) is the only roofing material that has no seams. Polyurethane foam roofs eliminate the need for counter flashing. Mark Bomber’s book, Spray Polyurethane Foam in External Envelopes of Buildings, reports on research that demonstrates ccSPF under typical building conditions (i.e. Will this work? Spray foam under the roof. Figure 5 . That way, you get the foam, the radiant barrier, and the ventilation too. Expanding insulating foam is a product that can be sprayed into small cracks and crevasses which then expands and stops drafts and leaks. Applications: Fits many profiles. Despite the advantages of using spray foam under the roof deck, there are some potential risks. Reduced ponding due to unique roof designs and various application thicknesses to create a positive slope and improve drainage. 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. 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. 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. Often light-weight foam can be applied over an existing roof-membrane (i.e. With every insulation material and project, there are always challenges to consider. Landfill waste is a significant issue with roofing. At year 10-20, a contractor will add more coating and granules. 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. 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. You can purchase expanding foam in a spray can with an attached nozzle for reaching into tight areas. 2. It has 8" of spray foam insulation on the roof deck and 4" in the wall and crawl space. Open cell spray foam is the most cost-effective way to insulate a metal roof. 4. Spray foam insulation, also called spray foam or spray polyurethane foam (SPF), is an alternative to traditional building insulation. 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. Spray foam can be found in … 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. I want to build the best structure possible. 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. Double-Deck Roof System - Two decks with two layers of radiant barrier make a ventilated skin over full foam sealed attic. Use Spray Foam Without Solvent Handy. 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. Spray foam is applied directly where it’s needed, ensuring that any ventilation vents are left untouched. Ridge Closure & Venting Foam, for Metal Roofing, 1-1/2" Hi-Rib Profile for up to 7/8" High Ribs. Reduced leakage due to coverage around seams, penetrations, parapet walls, HVAC curves, vents and skylights. 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. Open cell means that the tiny foam cells aren’t completely closed. 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. So spray foam isn't my first choice but I'd certainly take it over batt insulation in a home. 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. It’s terrific because it’s pretty much the same temperature as the rest of the house all the time. Which then expands and stops drafts and leaks system - Two decks with Two layers of radiant barrier make ventilated! 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