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Old 01-28-2011, 01:45 PM   #16
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Finishing crawl space


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Originally Posted by Jackofall1 View Post
If that is the case then you should be good structurally, the next thing is, insulating the roof side if you are thinking of covering the rafters.

It looks as if you have this area open to the house already. Is it not cold where you are, that being said how hot will it get in the summer?
There is currently a small plywood access door that separates this area from the rest of the house. I would consider replacing that door with a small hung door of proper thickness and functionality.

If I insulate the roof and sides, do I run into any of the ventilation issues raised by Dexter?

Thanks.

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Old 01-28-2011, 01:45 PM   #17
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Should I use a vented door?
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Old 01-28-2011, 01:56 PM   #18
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The answer is yes, Dexter brings to the table some very valid points on ventilation, if there is existing soffit vents, which there should be. This being said there must also be a ridge vent to allow the air out at the top, is this the case?

The easiest way to deal with those would be not to insulate the rafters at all, just cover them, yes it would make the area cold in the winter and hot in the summer, then you would insulate the access door to the area.

Really depends on how far you want to take this idea.

Mark
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Old 01-28-2011, 02:03 PM   #19
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The answer is yes, Dexter brings to the table some very valid points on ventilation, if there is existing soffit vents, which there should be. This being said there must also be a ridge vent to allow the air out at the top, is this the case?

The easiest way to deal with those would be not to insulate the rafters at all, just cover them, yes it would make the area cold in the winter and hot in the summer, then you would insulate the access door to the area.

Really depends on how far you want to take this idea.

Mark
Not sure I want to take this too far. I don't think there are any vents in the crawlspace.
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Old 01-28-2011, 02:07 PM   #20
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As long as you follow standard rafter insulation practices, you should be fine.
Heating and cooling will be an issue. Heat build up in that area will be substantial in the warm months. Sunny days figure 120 degrees F.
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Old 01-28-2011, 02:17 PM   #21
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As long as you follow standard rafter insulation practices, you should be fine.
Heating and cooling will be an issue. Heat build up in that area will be substantial in the warm months. Sunny days figure 120 degrees F.
Ron
I am no expert, but I believe there will be a problem created if this advise is followed as there is already insulation and VB in the space (facing the conditioned side of the space below), if you add insulation and VB to the rafters with out consideration for this, you may cause or create a situation for condensation to form. Also if there are soffit vents they will need to be considered.

You could look at the rafters, are there any molded pieces coming up from the soffit through the insulation to allow air past the insulation?

Heres a good place to start for proper insulation ideas - http://www.buildingscience.com/docum...itioned-attics

And yes regardless of insulation if there is no heat or AC ducted into the area the space will be uncomfortable.
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Old 01-28-2011, 02:52 PM   #22
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I am no expert, but I believe there will be a problem created if this advise is followed as there is already insulation and VB in the space (facing the conditioned side of the space below), if you add insulation and VB to the rafters with out consideration for this, you may cause or create a situation for condensation to form. Also if there are soffit vents they will need to be considered.

You could look at the rafters, are there any molded pieces coming up from the soffit through the insulation to allow air past the insulation?

Heres a good place to start for proper insulation ideas - http://www.buildingscience.com/docum...itioned-attics

And yes regardless of insulation if there is no heat or AC ducted into the area the space will be uncomfortable.
You would rearrange the insulation as needed. As in,"standard insulating practices".
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Old 01-28-2011, 02:58 PM   #23
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You would rearrange the insulation as needed. As in,"standard insulating practices".
Ron
I haven't looked but in the standard rafter insulation instructions, do you always have spaces that are already insulated?

Is standard rafter insulation practices the same as standard insulating practices?

Again not an expert, just trying to help.
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Old 01-28-2011, 03:24 PM   #24
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I haven't looked but in the standard rafter insulation instructions, do you always have spaces that are already insulated?

Is standard rafter insulation practices the same as standard insulating practices?

Again not an expert, just trying to help.
You would remove the insulation from the current knee wall and move it to the new knee wall. You would add insulation to the rafter bays over the new space. You're basically extending the room outward.
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Old 01-28-2011, 03:34 PM   #25
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Originally Posted by Jackofall1 View Post
I am no expert, but I believe there will be a problem created if this advise is followed as there is already insulation and VB in the space (facing the conditioned side of the space below), if you add insulation and VB to the rafters with out consideration for this, you may cause or create a situation for condensation to form. Also if there are soffit vents they will need to be considered.

You could look at the rafters, are there any molded pieces coming up from the soffit through the insulation to allow air past the insulation?

Heres a good place to start for proper insulation ideas - http://www.buildingscience.com/docum...itioned-attics

And yes regardless of insulation if there is no heat or AC ducted into the area the space will be uncomfortable.
Thanks for the guidance and the link - I'll check it out. This may end up becoming either a fair weather space or a storage space - or it may just stay the way it is
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Old 01-28-2011, 03:42 PM   #26
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If you do as Ron says, you'd also need to install rafter vents from the soffit up to the sloping part of the existing room (and beyond if they don't already have them). Then re-use the existing half wall and floor insulation (making sure the vapor barrier is removed too) to put between the rafters and the studs in the gables. I'd also apply 1" of rigid foam under the rafters and attach drywall directly to it. By the time you've laid a floor in this area you might want to decide if your kids will get enough enjoyment outof it and if you can use this as an adequate access storage area when they get tired/too old for it!
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Old 01-28-2011, 03:43 PM   #27
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You would remove the insulation from the current knee wall and move it to the new knee wall. You would add insulation to the rafter bays over the new space. You're basically extending the room outward.
Ron
This seems to make sense - it resolves the venting issue and ensures proper air conditioning of the space (with a vented door).

I'll still check out the link. One unresolved question that remains has to do with air quality with respect to the removal or disturbance of existing insulation. From the the photos is there any way to tell if asbestos is involved here? Again, it looks like fiberglass to me. But also, as I mentioned in the original post, the house was built in 1970.

Thanks.
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Old 01-28-2011, 03:44 PM   #28
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It is FG bat, no problem other than it makes you itchy if you play with it.
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Old 01-28-2011, 03:46 PM   #29
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If you do as Ron says, you'd also need to install rafter vents from the soffit up to the sloping part of the existing room (and beyond if they don't already have them). Then re-use the existing half wall and floor insulation (making sure the vapor barrier is removed too) to put between the rafters and the studs in the gables. I'd also apply 1" of rigid foam under the rafters and attach drywall directly to it. By the time you've laid a floor in this area you might want to decide if your kids will get enough enjoyment outof it and if you can use this as an adequate access storage area when they get tired/too old for it!
Appreciate the guidance. Is the installation of rafter vents only necessary if there is preexisting venting coming out of the floor? What if the area has no preexisting venting?

Thanks again.
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Old 01-28-2011, 03:46 PM   #30
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It is FG bat, no problem other than it makes you itchy if you play with it.
I'll cancel any plans to play with it then

Thanks.

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