If you’re using low-density Home-Depot-sourced R-3.8 EPS foam (a sheet of white beads, like styrofoam), that means you need 2.7 inches of EPS to be code-legal and safe.
How thick should foam be for basement walls?
The thickness of foam insulation in basement walls will range between two to seven inches, depending on where you live and whether you use open or closed-cell spray foam insulation.
How thick should foam board insulation be?
Most panels range between 3/8″ and 2.5″ in thickness, though other dimensions and thicknesses are usually available through custom order.
What rigid foam insulation is best for basement walls?
Polyisocyanurate foam board with coated glass facer (CGF) is the best type to use on basement walls with its semi-permeable facer.
What is the R-value of 4 inch foam board?
Foam Board Insulation R-Value per inch
| Thickness (in Inches) | R-value (in I-P/Imperial) | RSI (R-value in Metric) |
|---|---|---|
| 2.5 | 15.5 | 2.7 |
| 3.0 | 18.6 | 3.24 |
| 3.5 | 21.7 | 3.78 |
| 4.0 | 24.8 | 4.32 |
What is best way to insulate basement walls?
Spray foam is probably the best possible insulation material for basements and damp areas. Closed cell spray foam is perfect for locking “out” the water vapor that inherintely wants to migrate from your damp basement walls to your finished basement rooms.
How thick should basement XPS be?
The thickness of the XPS will depend upon the climate and whether additional insulation will be added in a frame wall. We recommend a minimum of 1 inch of XPS up to a maximum of approximately 2 inches. that is trapped in place by the additional wood frame wall.
What is the R-value of 1 inch foam board?
3.6 to 4.2 per inch
The polystyrene is expanded. Styrofoam insulation is the cheapest material. R-values can range from 3.6 to 4.2 per inch.
What is the R-value of 2 inch blue Styrofoam?
A wall utilizing STYROFOAM T-MASS Technology with a 2-inch exterior layer and a 4-inch interior layer of concrete along with a 2-inch layer of STYROFOAM extruded polystyrene insulation would result in a material R-value of approximately 11.33.
What is the difference between pink and blue foam board?
Both are manufactured using the same process and contain similar chemical components. The two products also have the same insulating power. However, blue foam boards are manufactured by Dow Chemical Co. whereas the pink foam boards are manufactured by Owens Corning company.
What is the thinnest insulation board?
Thermablok® Aerogel is a revolutionary advancement in thermal technology offering the thinnest insulation available to prevent thermal and cold bridging. Classed as a Super Insulation, Aerogel has the highest insulation value of any known material with the lowest thermal conductivity value of any solid (0.015W/mK).
Does foam board insulation need a vapor barrier?
Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.
What is the thickest foam board insulation?
The thickest foam board insulation goes up to 6 inches thick, but needs to be custom ordered. Standard thicknesses available for most foam board insulation ranges from 1/4-inch to 2 inches, depending on the type. Obviously, the thicker the foam board insulation, the better it will be at insulating your home.
How thick does foam board come?
Foam board comes in three thickness choices: 1/8″, 3/16″ and 1/2″.
What is the R-value of 2 inches of spray foam?
R-Value In 2 Inches Of Spray Foam
The R-value ranges from R-3.5 to R-3.6 per inch. The filling of a 2×4 cavity yields about an R-13.
Which foam board insulation is best?
Polyisocyanurate: Known as polyiso for short, polyisocyanurate foam has the highest R-value per inch (R-6.5 to R-6.8) of any rigid insulation.
How do you attach foam board to plywood?
- Measure the wood before you begin. …
- Wipe down the wood surface with a clean rag. …
- Coat the wood with foam insulation adhesive, then press the insulation lightly against the wood. …
- Wait until the initial bond sets, them press the foam insulation firmly against the wood.
Is rigid foam board a good insulation?
All types of rigid foam board insulation have several common characteristics or features. These characteristics are: Excellent heat-resistant properties. In fact, this is the insulating material with some of the highest R-values currently available.
What is the R-value of ISO board?
For the R-value of polyiso wall insulation, a full thickness, 180 day aged value is recommended. Foilfaced polyiso has an R-value of about 6.5 per inch and permeability faced polyiso wall insulation has an R-value of around 6.0 per inch.
What is the R-value of 1.5 inch foam board?
R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation
| Thickness (Inches) | R-value (in I-P/Imperial) | RSI (R-value in Metric) |
|---|---|---|
| 0.75 | 4.5 | 0.81 |
| 1.0 | 6.2 | 1.08 |
| 1.5 | 9.3 | 1.62 |
| 2.0 | 12.4 | 2.16 |
How thick should my insulation be?
The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
