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Vaulted Ceiling, insulation

Recently purchased older home with an area in the LR with vaulted ceiling with rafter beams stained dark. Son in law feels the 1" foam and drywall are not enough insulation (NJ)and wants to correct and still not lose the beam look. I suggested another layer of 1-2" foam and a layer of drywall. If this detracts the size of the beams, faux "C" beams could be added over the top of the existing beams, beefing them up visually. Ceiling has no leaks, staining, etc. Too much weight to add?? Saw in one post that 3/4 in plywood would be better to start. Assume by age of home this is not what is probably there. Comments?

Re: Vaulted Ceiling, insulation

There may be another method to consider ... depends on the condition of the existing roof.

In commercial roofing rigid foam sheets are used on the outside with the roofing material placed over top.... this has also been used for residential roofs in such a case as yours as well .... quite frankly this is also a method I've been entertaining doing myself.

Now ... if your roof happens to need re-shingling you might consider installing rigid foam sheets to the roof deck with an OSB or plywood decking secured over top with the new shingles placed on that.
What this will do is provide more insulation but also a continuous thermo break which increases the insulating performance. The combined value of the continuous insulation on the top of the roof with what is currently in place on the underside will have obviously have increased .... but you won't have to do any remodeling to the inside.

However ..... this will add some costs to the roofing because of a second layer of roof sheathing as well the fascia trim will need to be addressed because of the extra thickness added. The eves troughs would also need to be repositioned as well.

Food for thought. :)

Re: Vaulted Ceiling, insulation

Thanks for the info, will definately consider. The area of roof is small and will need reroofing in the next year or so...might be the way to go, even if only on this portion of the roof. Other areas are not cathedral so might have more insulation. :)

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