Adhesive and Sealant for Problem Screws on Metal Roof
I've been having problems with the screws backing out on my metal roof. Unfortunately, the sheathing used was 1/2" OSB. I'm sure that was most of the problem. Two years ago the contractor who installed the roof came out and tightened the screws. A few screws were replaced with over-sized screws (5/16" hex head). To date none of those screws ...
Sealing a ridge vent - GreenBuildingAdvisor
2018年3月3日 · However, for my purposes this would be a temporary measure to see if a hot roof or vented roof is preferable. The building is currently unconditioned, uninsulated and unoccupied. There is a ridge vent but no soffit vents. it is a straight sloped 45 degree roof, no hips, valleys. 4C climate, so primary concern is moisture penetration.
Sealing Ducts: What’s Better, Tape or Mastic?
2010年8月6日 · Mastic is a gooey, non-hardening material with a consistency between mayonnaise and smooth peanut butter. Duct joints should always be secured with #8 sheet-metal screws before seams are sealed with mastic. Sealing duct seams is messy work, so wear old clothes. The mastic is spread over duct seams with a disposable paintbrush, putty knife, or ...
Spraying Polyurethane Foam Over an Existing Roof
2013年2月4日 · When Taya and Stephen Shoup's old tar-and-gravel roof began leaking, the couple hoped to find a replacement roofing that would be energy-conserving, leakproof, cost-competitive, and reasonably green. As the house's roof sheathing doubled as a finished ceiling, the old insulation was scant. They broiled in the summer and hemorrhaged money during the heating season.
How to seal a Bilco door to prevent heat loss and moist air transfer?
2013年5月12日 · Outdoor metal surfaces will always get extremely hot and cool basement air on the underside will generate condensation. Bilco brand doors are designed to be weathertight but are intentionally designed with air gaps on the underside. This equalizes the temperature on both sides of the metal doors to eliminate condensation.
How to Make a SIP Roof Better - GreenBuildingAdvisor
2011年11月9日 · Roger Lin’s Washington, D.C., house will have a roof of 12-inch-thick structural insulated panels (SIPs). By most standards, that’s a well-insulated roof. But Lin wants to add 2 inches of rigid foam on top of the panels to reduce thermal bridging. He’s uncertain about the details. He has already installed roofing underlayment over the panels. Can he put expanded polystyrene foam on top ...
Pressure-Treated Sill Plates and the Building Code
2009年3月9日 · The reason is simple: sill sealer. The light blue sill sealer installed between the bottom plate and concrete (most likely for air sealing) in the top photo is closed-cell foam. It’s meant to be an air-sealing gasket, but it also is working as a capillary break because it keeps water in the concrete from wicking up into the wood.
Open-Cell Foam Beats Closed-Cell Foam - GreenBuildingAdvisor
2009年10月28日 · By Jim Coler When shopping for spray foam insulation, many builders and homeowners are uncertain whether to choose an open-cell product or a closed-cell product. In my opinion, the choice is clear: for above-grade residential applications, the best choice is usually open-cell foam. In most cases, open-cell foam will be more economical, more flexible, and more forgiving with moisture than ...
Tips for Working with Zip Sheathing - GreenBuildingAdvisor
2015年1月26日 · The roof has continuous ventilation under the metal from eave to ridge. Tip #2: Install base wall flashing. In almost every house I remodel, I find rot at the base of the outside wall sheathing. I believe you must use a base wall flashing to protect the raw edge of whatever sheathing product you use.
How to Seal Sheathing Boards - GreenBuildingAdvisor
2013年11月4日 · The use of plywood and OSB sheathing is a fairly recent phenomenon. Before these sheet goods became readily available, builders nailed wood boards to the frame of a house for sheathing, and it is a house with this type of sheathing that Nick Welch is trying to update. His 900-square-foot house in Climate Zone 4C is sheathed with 1x8 boards, apparently over a layer of asphalt felt. There is ...