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I have an 1800 sq. ft. 40 yr. old house with an exposed beam ceiling , about 1/3rd are bed and bath with dropped ceiling . The pitch is 2 in 12 or a little less . The existing roof [ how they ever got this permit signed off is beyond me ,I checked with the building dept. and it is on file ] is some type of insulation board brown in color not foam , paper and three tab comp, nailed on top of that every nail they drove through the
comp leaks . I was thinking about stripping the roof installing 2×4 sleepers on edge 3 1/2″ ridged foam [r25] sheathing with 1/2″ ply and a hot mop with a cap sheet done buy a roofer . I thought [ could be trouble ]
how much more expensive could it be to reframe the roof to maybe a 4 in 12 and go with a nice random tab comp. I have a hvac unit on the roof which drops through the roof to feed the dropped ceiling rooms and ducts on the roof going to a room addition . If I had some attic space I could get the ducts off the roof and insulate with a less expensive insulation plus opening up lighting and other oppions you don’t have with out attic space . Now the big question could I reframe a roof over the old roof legally , what would I do with the existing rafter tails [4×6 4′ o.c. 2×6 t&g on top ] cut them off . There are large overhangs for porch cover that would change if not go away with a different pitch on them . Thanks Randy
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I would rework the roof to a 4/12 minimum......it's not that difficult, I've done it by myself on a few occassions.
For the particulars..get a carpenter/builder to look at it.....and give you on site info.
*Sounds to me like you've pretty much made up your mind that you want to re-work it. I hate low sloped roofs, and so would also tend to go that route. Do you have something to run a 4/12 roof up against? If not, maybe that's the reason they put the low sloped roof on in the forst place. If you're going to increase the pitch, and want some attic space, why not go higher? A steeper pitch will give you more room, and shed water better.
*The Boss is absolutely right -- the higher the dryer. If you're going to do all that work, gain yourself some more attic space and go as high as you can.-- J.S.
*Boss what do you mean [Do you have something to run a 4/12 roof up against]. Can I frame over the old roof which 2x8 t&g and tie into it , and what do I do with the raftr tails cut them off or can I end the new rafters on top of the of the old ones . Randy
*Got a cut-a-way drawing?