Insulating utility room addition, irregular studs

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  #1  
Old 10-27-05, 12:09 PM
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Question Insulating utility room addition, irregular studs

We have a 1950's brick ranch that has had a utility room added on to it. The wall are built out of 2x6, unfortunately irregularly spaces (between 19 to 24 inches). Siding is fiberboard attached to 3/8" plywood. No vapor barrier that I can see. The roof is likewise irregulary spaced as they tied in the rafters to existing rafters in the main roof line. It sits on a cement slab (the house itself has a crawlspace).

Any suggestions for the best way to insulate this space? I would like to insulate it and then run a hvac vent into the room to heat the space.

Thanks!!!!!!!!! :-D
 
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  #2  
Old 10-27-05, 12:23 PM
Join Date: Mar 2005
Location: USA
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Insulating utility room addition, irregular studs

Go with rigid insulation (extruded polystyrene) on the inside, then sheet rock it. You will probably need some jam extensions for doors and windows, depending on the type. If you build tight or tape the joints, you will have a vapor barrier where you need it.

Dick
 
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Old 10-27-05, 12:33 PM
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So I understand: Ridig foam applies over the studs, correct? And then sheetrock over the foam? And this would likewise work on the ceiling/attic? It leaves a large air gap between the foam and the siding, correct? The doors and windows need to be replaced anyway, so getting jamb extensions is no problem.

Thanks
 
  #4  
Old 10-27-05, 02:39 PM
Join Date: Mar 2005
Location: USA
Posts: 6,126
Insulating utility room addition, irregular studs

You have the right idea!

Make sure you mark where the studs are so can attach the sheet rock through the foam and into the stud (long screws). I would use 5/8" sheet rock because of the wide stud spacing - your wall will be stiffer and hopefuly straighter. The extra weight should not be much of a problem on a wall.

The foam can be up to you and your climate. This will perform far better than a stud and fiberglass batt wall of the same R value - better use of insulation and less infiltration..

Dick
 
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