Use caulk or foam sealant to seal the joint between the top.
Best insulation for between floor joists.
Second i have foundation vent all around the house should the remain unblock or do the need to be covered.
Department of energy recommends r 11 3 insulation under floors in warm climates and an r 25 6 to 8 in cold climates.
Fill the ends of joist bays with rectangles cut from rigid board insulation.
Gaps between the insulation and the floor can.
Fiberglass insulation batts or rolls are the most economical and easiest diy choice for insulating between the floor joist in a crawl space.
First insulation will be going between the floor joist i only filled gaps with foam.
Use foam sealant such as great stuff to seal the joints.
Ground should be covered with a 6 mil polyethylene sheet.
Joist bays the open spaces between floor joists are prime hosts for insulation under specific circumstances.
The insulation should press right up against the floor between joists.
We chose 2 in thick r 10 extruded polystyrene don t use expanded polystyrene which is a less effective air and moisture barrier.
Rigid foam is the best insulation for rim joists.
When the basement or crawl space has vents installed insulating joist bays.
Check between floor joists if vented and check perimeter walls if unvented.
Clarification for march 23rd e mail.
Fiberglass insulation is usually the best option though handling fiberglass can be dangerous and it is not the most eco friendly option in some cases.
According to the 2012 irc the minimum r value for floor assemblies is r 13 in zones 1 and 2 r 19 in zones 3 and 4 r 30 in zones 5 and 6 and r 38 in zones 7 and 9.
If you want to insulate a floor assembly by leaving the joist bays empty and installing rigid foam on the underside of the joists here are a few things to keep in mind.
Turn off the electricity then remove an electrical outlet cover for a view of exterior insulation.
Exterior walls and floors.