Exterior Sheathing Insulation Provides Energy Efficient Solution
Last week we talked about building your above grade walls with the Advantage ICF System® which is great for a new construction project. What do you do when you have an existing home that needs that level of insulation to make it comfortable? That brings us to this week’s insulation solution: Exterior sheathing, also known as continuous insulation. (Note that exterior sheathing can also be used in new construction as well)
People are continually looking at different ways to increase their energy efficiency and decrease their energy costs. So what do they do? Replace windows and doors. Well that’s a great start, but what about all that space between your windows and doors? How much energy do you think is leaving through your walls every day? Parents are always after their kids to shut the door so we don’t let the heat or cool air out but in reality, you could be losing up to 33% of your heating and cooling through your walls each day.
So how do we fix this? Well, this is where PlastiSpan insulation saves the day. It is more cost effective and time effective to increase your R-Value above grade by going from the outside in then from the inside out. Make sure you check your local building code; see what they have for rules, requirements and restrictions. This will save you from problems later on.
*All insulation will be called PlastiSpan from here on, but any of the 3 is the right insulation solution for this application.
A little overview of the 3 types so you can chose the best for your application
- PlastiSpan has the lowest cost/R-Value for rigid insulation
- PlastiSpan HD is also a more cost effective product than other rigid insulations. It gives you a slightly higher R-Value and compressive strength than PlastiSpan too.
- DuroFoam is an ideal product for sheathing because it has been laminated on both sides, one with a green film and one with a silver one
The reflective facer on DuroFoam insulation contains a thin layer of foil embedded within the film. The reflective facer does not increase the nominal R-value of DuroFoam insulation. The green face of DuroFoam insulation should be left exposed to make use of the markings on this face provided for easy cutting of insulation and spacing of interior framing as required.
After you have chosen which type of PlastiSpan insulation you are going to use and have removed all your existing siding, you need to plan out the joints. Apply one of the PlastiSpan insulation products over the exterior of the wood framing. All vertical edges of the PlastiSpan insulation need to be butted tightly together over stud locations for adequate support.
Make sure you are using the correct fasteners. PlastiSpan Insulation must be fastened to framing using fasteners with heads or washers at least ½” diameter where the cladding will be applied directly against the insulation. Fasteners with heads or washers at least 1″ in diameter must be used where an air space will exist between the PlastiSpan insulation and the cladding. (The fasteners are usually a nail with a green washer around it).
A sheathing membrane is not required if all joints between the PlastiSpan insulation and all openings in the wall are taped using a sheathing tape to seal them. Installing exterior cladding; cladding must be attached to the wood framing members so they need to be long enough to penetrate through the PlastiSpan insulation and at least 1″ into the wood framing.
This should finish off the exterior of your home. New doors, new windows and by using PlastiSpan insulation under your sheathing, it will make a huge difference on your energy bills every month, plus increase the comfort inside your home. It’s a win-win situation, and who can resist a win-win?
Visit www.plastifab.com for more information on exterior sheathing.