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Old 02-21-2013, 08:25 PM   #16
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Attaching bottom plate to subfloor


bdunkin please take the time to add your location to your profile.
Main reason is I see you did not add to the rafters so there's no way to fit much insulation and the needed baffles.
http://www.energystar.gov/index.cfm?...sulation_table
There also need a be a window that meets egress code.

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Old 02-21-2013, 08:29 PM   #17
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Attaching bottom plate to subfloor


Southeast Alabama. 5/0 window is going in existing exterior wall on Tuesday for egress. I will frame a sill around the window on the new wall. There is already a room on the second floor so I have full size steps for second monastery of egress.
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Old 02-21-2013, 10:25 PM   #18
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Attaching bottom plate to subfloor


Why wouldn't u just use the exterior wall itself with insulation.( if u just need thicker insulation add whatever thickness u need an screw into the exterior studs)
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Old 02-21-2013, 11:04 PM   #19
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Attaching bottom plate to subfloor


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Originally Posted by bduncan118 View Post
Gary,
The walls do not tie into anything up there. They will be 4 independent walls (with a ceiling of course). The rafters are above where the room will be. The subfloor itself is 3/4" T&G that is glued and nailed. I will be screwing it down before the carpet goes down.

Where u see the bottom plate on the right of this picture is where the wall will be going. It is 3 1/2'' off the exterior wall.
The only way the subfloor would sag under the weight of that wall would be if the subfloor was 1/8" sheathing. Seeing as how you've said you have 3/4" you'll be fine without blocking, just add construction adhesive if you want to make it a little stronger, also criss cross your nailing pattern to hold the bottom plate in the subfloor.
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Old 02-22-2013, 05:55 AM   #20
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Attaching bottom plate to subfloor


First off thanks everyone for your replies! The reason I am not using the existing exterior wall is the fact that it is structural and I don't want to cut all the studs to put a header in. And the fact that the wall possibly could not be straight. There is a cross brace (24) against all the studs at 7' that would have to move. I would rather not mess with anything structural. That is why I'm having a contractor put in the egress window.
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Old 02-22-2013, 06:47 AM   #21
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Attaching bottom plate to subfloor


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uncertain what ' construction screws ' are but i use what on the shelf then again, never said i was a carpenter another advantage of being raised on a farm - baling wire & chewing gum now updated to version 2.0 - duck tape
Construction screws look like drywall screws but are much stronger. The head on drywall screws is specially shaped on the underside so it will dimple the drywall, and will often snap off if you screw them into wood too fast. Drywall screws are always black (in my experience anyway), while construction screws are usually gray, brass-looking, and sometimes green. Then there are deck screws, which are coated (or made of stainless steel) to prevent the chemicals in pressure treated lumber from eating them away.

Check the fastener aisle next time you're in a big box store. Each of these three types of screws usually come in different-colored boxes.

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Old 02-22-2013, 10:41 AM   #22
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Attaching bottom plate to subfloor


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Originally Posted by bduncan118 View Post
Gary,
The walls do not tie into anything up there. They will be 4 independent walls (with a ceiling of course). The rafters are above where the room will be. The subfloor itself is 3/4" T&G that is glued and nailed. I will be screwing it down before the carpet goes down.

Where u see the bottom plate on the right of this picture is where the wall will be going. It is 3 1/2'' off the exterior wall.

looks like you are good to go with setting the walls onto the sub floor, the only questionable wall would be the one on the left in pic as it goes parallel with joists though the joists might be going 12" centers which helps a lot. what type of attachment detail is at the top of wall where it is against the roof rafters? looks like the very back corner of plate bumps rafter?? also, you will need access into the attic area somewhere along the knee walls forming the rooms in the attic, attic access weather sealed door.

Last edited by hand drive; 02-22-2013 at 10:44 AM.
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Old 02-22-2013, 10:56 AM   #23
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Attaching bottom plate to subfloor


The walls won't touch the rafters. That back wall is where the roof slope comes down and there is about 8" of clearance from the top of the wall. The left wall is actually on a floor joist so nailing won't be an issue there. To the left of the left wall will be a storage room with a full size door going into it.
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Old 02-22-2013, 11:44 AM   #24
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Attaching bottom plate to subfloor


That exterior wall on the right is a gable wall only load bearing points are 2 corners and possibly under the ridge, if u r putting a window there u gave to put header anyway. 2nd if the new wall is separated from the exterior u r not going to be up to fire code
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Old 02-22-2013, 11:53 AM   #25
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Attaching bottom plate to subfloor


I'm very curious about not being up to fire code. Can you explain a little further? How would I put a header in the existing wall If that is what i need to do?
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Old 02-22-2013, 12:01 PM   #26
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Attaching bottom plate to subfloor


Fire code if any fire were to happen in a bay u wsnt to prevent from getting to another bay if they r not connected you would have direct flow all a fire needs to grow is air
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Old 02-22-2013, 12:07 PM   #27
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Attaching bottom plate to subfloor


I do it all the time on existing houses. Determine height of window header cut studs to line with saw cut a little bigger than header height ways grind or saw all nails insert header put in jacks. Measure down from bottom of header the tough opening size for window add 3 in cut remainder of 2x4 in the way insert 2 sills and 2 crips on jacks under sill ready for window. Everything done from inside
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Old 02-22-2013, 12:07 PM   #28
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Attaching bottom plate to subfloor


My plans are to insulate that cavity. There's got to be a way around that. Any thoughts on connecting the 2?
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Old 02-22-2013, 12:09 PM   #29
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Attaching bottom plate to subfloor


Connect 2 x to your exterior studs and bottom, top plates with screws
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Old 02-22-2013, 12:10 PM   #30
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Attaching bottom plate to subfloor


I am thinking how would I put a top plate in the existing wall for the ceiling joists to attach to. The ceiling joists will run perpendicular to that wall due to the span of the room.

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