We chose 2-in.-thick (R-10) “extruded polystyrene.” Rigid foam is the best insulation for rim joists. You can insulate second-floor rim joists following the same steps shown here if you happen to tear out a ceiling during remodeling. What kind of insulation is best for rim joists? In this blog post we explore some of the options available. When insulating a pitched roof at rafter level there are a number of key design considerations which will affect the build-up of the roof and the choice of insulation. This loft void would still be quite cold though as any heat from the house is largely being prevented by the insulation at ceiling level.Ĭan a pitched roof be insulated at rafter level?
You would need to retain a route for ventilation from the eaves up to the ridge by adding continuous ridge ventilation or several tile vents near the ridge. Is it good idea to insulate joists and rafters? Measure the width of your rafters – this is important if you are thinking of insulating below the rafters. Take into consideration the thickness you want to insulate – it is recommended you insulate to at least 100mm to get the optimal performance. How much insulation do I need between rafters? The contractor would need to cut the panels to fit tightly, and caulk the spaces in between the insulation and joists. One tactic is to place rigid insulation panels between the floor joists. Insulating under the floor will prevent drafts from entering via the gap between the floor and the ground. Rigid foam insulation comes in 4-by-8 sheets and attaches in a method similar to installing drywall panels.
You can add additional insulation value by installing rigid foam insulation over the surface of the new rafters and batt insulation. How do I make my rafters deeper for insulation? If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. Any narrow gaps between a joist and perimeter wall should be insulated by specially cut pieces of board which in turn should be supported on blocks nailed to the underside of the joists. Make sure that insulation boards are fitted tightly between joists and any gaps are filled with expanding urethane sealant. If you were really concerned about losing height you could use a rigid insulation between the existing ceiling joists and a thin layer of continuous rigid insulation above the top of the joists and then board on top.