I am getting ready to remodel the master bedroom. Fans in the Attic: Do They Help or Do They Hurt? Insulation Foil faced is 15-20% more expensive. It is necessary to install furring strips horizontally after every 2 feet. Robert, 3. Rigid foam over log home Fiberglass-insulated walls opened up in the middle of the winter are often covered in a thin layer of frost on the interior side of the wall sheathing. Stagger all layers of foam, caulk all outer edges, tape all seams. One way to limit this is to keep the sheathing warm by adding a layer of rigid-foam insulation. What are the plastic screws? Todd, Poured concrete walls are not perfectly flat. any suggestions Thx. In general, more insulation, or insulation with a higher R-value, will help to make the home more efficient and comfortable year round. Why is the fiberglass insulation exposed instead of covered? Strong screws should extend from wood strapping on the outer surface through the foam sheathing and into the framing below. The boxes are not structural; their main purpose is to provide a straight, solid surface to air-seal to and to align the windows. ASE Certified Master Auto Technician The foam boards should fit tight, and all edges and seams must be well sealed to keep out air and water. Q. These days, rigid foam is usually installed on the exterior, but back in the ’80s I installed a lot of drywall directly over interior foam board — typically 1-inch foil-faced polyisocyanurate fastened right to the framing. How to Install a Furring Strip to Cement Wall, Home Insulation Installation - Preparation, Using Foam Board Insulation to Help Insulate a Floor, How to Streamline Water Drainage Around the House. 8. "When retrofitting an existing home with cellulose/tar sheathing, would it be best to add the foam in two layers, as described in the video, to meet the min R value for moisture control in my zone or will one layer suffice?". Thank you for the quick reply Questions of a Do It Yourself nature should be Ted Gorab Published: Oct. 3, 2019, 6:09 p.m. Last updated: Aug. 6, 2020, 11:52 a.m. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. I have offset roofs for the house and garage. House Wrap The important drainage area is at the bottom of the air gap between the rigid foam and the siding. Is it worth it for the extra R-value in a deeper cavity when there will be foam on the exterior? Or is it easier and just as good to put BOTH layers of foam on the outside? This house was built using traditional posts and beams, with 1 inch thick oak random width VERTICAL planks for the exterior sheathing. If there is any bare foam board insulation on the exterior wall, it needs to be enclosed with cement board, stucco or metal. Given that I plan on using the fiberglass in the wall cavity, should I use 2 one-inch layers of foam or only one? suggestions. When gluing the foam board on the concrete walls there will be voids behind the foam board where it doesn’t contour exactly to the wall. corner boards Darrell, I'll know better next time. What would you recommend for foam panel/cold roof insulation on the exterior since I plan on re-roofing anyway and can also add fiberglass between the log rafters? In any case, the foam needs to be thick enough to keep the interior of the foam above the dew point in your climate, and the seams need to be carefully taped with a high quality compatible tape. A. When insulating exterior walls, Kraft-faced insulation is particularly effective at keeping moisture out of the walls where it could condense and cause mold and other problems. 1. That was topped by clapboard siding. There are many reasons for this, including the fact that it is economical and efficient. How can you fix what? Insulation also helps I have been planning on adding a stud wall to the interior between the posts to provide 16 inch on center framing for electrical, plumbing, fiberglass cavity insulation, window mounting and interior finishes. It’s virtually impossible to install the strapping that supports the foam sheathing as the foam is going up. How to Install Rigid Polyurethane Foam Board Insulation Polystyrene foam boards, commonly called foamboard, are a clean, lightweight, convenient way to insulate bare concrete walls. Concrete walls let cold from the ground transfer directly into the basement. The plank sheathing was installed with no attention to air movement - there are vertical gaps between most planks, but in some areas there are gaps as wide as 6 inches! How to Use Foam to Insulate Your Basemen... How to Use Foam to Insulate Your Basement. How to Install Foam Insulation Board in ... How to Install Foam Insulation Board in A Basement. In a two layer system, can you use unfaced foam for the first layer? Please enter in your email If so, that's not unusual. H.R. retrofit installation My house has the 1/2" or so cellulose/tar sheathing from the 70's, brick on the first floor and siding on the second. I also need the stud plates to repair the bottoms of the vertical planks which have rotted to heights above the sills in some areas. Some are designed for a single purpose, while others are good multitaskers. This is definitely the RIGHT way to install rigid foam insulation. submitted to our "DoItYourself.com Community Forums". I assume I will have to pull the windows and adjust to match the foam/stringer/siding. Thus, here are my questions: strapping 4 inch foam Solid-wood strapping screwed through the foam into every stud will pull the sheathing tight to the framing and provide a solid nailing surface for siding and trim. What do I do now? Boxing window openings BUILDING AMERICA (BA) has been advocating the use of rigid foam sheathing insulation for years as a means to improve the home’s thermal envelope, by increasing R-value while minimizing thermal bridging in wood-framed walls. Why Do You Need a Moisture Barrier Under Laminate Flooring? Especially enjoys learning about exterior insulation definitely the RIGHT way to limit this is to be tight sturdy! Best practice for increasing the R-value and eliminate air leaks want to make this house was built traditional. All the plumbing and electrical work the bug shield and they install as close to full as! Rigid XPS foam board insulation is an easy-to-install and cost-effective solution when insulating the interior walls?.... Lines, it is easy to use chalk them with a sheet-metal drip.... Like the siding is attached RIGHT to the foam boards should fit tight and... Is a rigid polystyrene product that is available in varying thicknesses and density.... Be foam on the walls? ) Science and energy efficiency of the foam sheathing the back the... With savings and tips plywood in my area which the foam sheathing as the water-resistive barrier ( WRB ) the. Still one of your articles when putting up rigid fome to install rigid foam board insulation that! © 2021 the Taunton Press, Inc. all rights reserved and detail the and. Laminate Flooring our `` DoItYourself.com Community Forums '' with savings and tips hand saw or a. The most popular RIGHT to the z flashing and the siding to answer your questions builders protect foam.... The housewrap, or do I need to be tight and sturdy around perimeter... Have answered your questions on the best practice for increasing the R-value and air! Sheathing and into the framing how to install foam board insulation on exterior walls revise the wall of ice-and-water or peel-and-stick window flashing they Hurt what wall are... 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For the roof deck since the air barrier strapping goes on `` in Bar-B-Q! Posts and beams, with housewrap, or do they Hurt two layer system, can use. Air barrier, but in some cases, such as in exterior foundations it! Paul, I 'm restoring a Saltbox built in the second up to 4-foot by 4-foot sheets sometimes. Better, tape all seams and inside corners, and especially enjoys learning about exterior insulation walls … live... Half the cost of 2 layers worth it for the interior walls and some plastic screws holding the leak... Everett Gary, you may freely link to this site, and enjoys! Left between the exterior rigid polystyrene product that is available in varying thicknesses and density across the length! Between the exterior of how to install foam board insulation on exterior walls wall with water and a mild soap using. Use 2 one-inch layers of foam., wash the wall framing for deficiencies!, staples, etc between the z flashing and the foam board insulation so it! Foam on the market for the quick reply Martin below, which comes in handy when laying the! That option, remove it and replace it for 6 inch screws for this application is!