Hi. We have a laundry room that's situated within the garage structure part of the house. Typical triangle shaped roof on a box. The laundry room fills up about 1/4th on the back wall. Ceiling is flat but Up above there's the empty wedge shape. Can I remove the flat ceiling and make a slanted roof for laundry room? This will make the finished ceiling right near exterior roof. Is this a bad idea? I guess all cathedral ceilings are like this though ?
Chances are that there is probably insulation on top of the ceiling. If you remove the ceiling you will have to probably reframe some verticle walls to insulate on the sides to say nothing about the ceiling itself. The area where the rafters are will have to be insulated. If you have a ridge vent then you will have to install rafter mates or similar to enable the air to travel to that ridge. You will probably not get the R-value in insulation between the rafters as you have on the flat ceiling. Honestly I can't see where you will gain anything raising the ceiling.
The other challenge is the ceiling joists across your garage and laundry room keep the walls and the roof from spreading out. If you cut them off you'll need to reframe the space so your roof doesn't collapse.
I'm not sure a cathedral ceiling in your laundry room is going to be that much of a must have item for the next buyer of your house to make it worth the expense.
Cathedral ceilings are framed differently than flat ceilings. You also don't mention whether you have roof trusses or ceiling joists and roof rafters. Trusses can't be modified, You'd need to have new trusses engineered, which would require reroofing, or stick build a new roof structure under the existing roof deck to replace the trusses.
Any advice given here is general in nature and is not necessarily valid for your given area. If in doubt check with your local codes enforcement department for what is required when doing electrical, plumbing or structural work on your house. Permits may or may not be required in your area and home owners may not be able to DIY some tasks. I have no way of knowing if you have the skills needed to complete the tasks you are asking about, when in doubt seek professional assistance.
My advice may be worth exactly what you pay me for it. :-) For the record I did not stay in a Holiday Inn Express last night.
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