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PurpleBee11 May 2026 20:30In our renovation project, we have now reached the roof stage. So far, aluminum foil-faced glass wool insulation was installed in both the collar beam ceiling and the slope up to the ridge. This insulation was very damaged, and since we are renewing the ceilings on the upper floor, we have removed it.
The insulation on the upper floor is fairly straightforward. We will insulate the slopes up to and including the collar beam ceiling and install a vapor retarder with variable permeability, airtight on the warm side. Additionally, we plan to replace the attic ladder.
My question concerns the loft space. We would like to use it as a storage area. Does it make sense to add wood fiber insulation to the loft slopes to help moderate the significant temperature fluctuations? In this case, without a vapor retarder, so that any remaining moisture can escape through the roof structure. No underlay membrane is installed.
The insulation on the upper floor is fairly straightforward. We will insulate the slopes up to and including the collar beam ceiling and install a vapor retarder with variable permeability, airtight on the warm side. Additionally, we plan to replace the attic ladder.
My question concerns the loft space. We would like to use it as a storage area. Does it make sense to add wood fiber insulation to the loft slopes to help moderate the significant temperature fluctuations? In this case, without a vapor retarder, so that any remaining moisture can escape through the roof structure. No underlay membrane is installed.