Insulation installation

[mark petty]

Mid Florida stilt home (Ocala area). This is a new construction stilt home that has partial garage underneath and partial open parking area. The garage ceiling will be drywalled and the open parking area will have something like T-111 or plywood. Being from the north; having hard time with insulation installation pertaining to vapor barrier and what type of facing and its orientation. Hoping someone could help me out on this. Seems everyone I talk to has a different opinion. Btw: home has 2x6 wall studs and 16" floor trusses 16" O.C. - Typical vented attic. Using only fiberglass batt insulation. Home is currently wrapped in Tyvek over plywood sheathing.

First off, the floor: faced or unfaced - paper up or down - permeable or not -

2nd the walls: faced or unfaced - paper towards exterior or interior - permeable or not

3rd the attic: faced or unfaced - paper towards the attic or ceiling - permeable or not

Do the make fiberglass batts with permeable paper facing?

Also, what are code requirements or recommendations for depth (R-value) of insulation at floor and attic.

Thanks

[Jerry Peck]

A vapor barrier is not required in Florida for exterior walls or floors, basically only under concrete slabs on grade.


First off, the floor: faced or unfaced - paper up or down - permeable or not -

I would go with faced, paper side should always go to the warm in winter side and in substantial contact with the underside of the subfloor. The paper facing is not really a vapor barrier.


2nd the walls: faced or unfaced - paper towards exterior or interior - permeable or not

Faced with the paper facing toward the warm in winter side where it will be in contact with the backside of the drywall.


3rd the attic: faced or unfaced - paper towards the attic or ceiling - permeable or not

Faced with the paper facing toward the warm in winter side where the facing is in substantial contact with the back side of the drywall ceiling.


Do the make fiberglass batts with permeable paper facing?

Basically, the paper facing is permeable to some extent.


Also, what are code requirements or recommendations for depth (R-value) of insulation at floor and attic.

From the 2010 FBC-Energy Conservation Code:
- 402.1.1 Component criteria. - - The building thermal envelope and air distribution system shall meet the requirements of Table 402.1.1.
- - - TABLE 402.1.1 COMPONENT EFFCIENCIES REQUIREDa, l
- - - (see attached)

[mark petty]

A vapor barrier is not required in Florida for exterior walls or floors, basically only under concrete slabs on grade.



I would go with faced, paper side should always go to the warm in winter side and in substantial contact with the underside of the subfloor. The paper facing is not really a vapor barrier.



Faced with the paper facing toward the warm in winter side where it will be in contact with the backside of the drywall.



Faced with the paper facing toward the warm in winter side where the facing is in substantial contact with the back side of the drywall ceiling.



Basically, the paper facing is permeable to some extent.



From the 2010 FBC-Energy Conservation Code:
- 402.1.1 Component criteria. - - The building thermal envelope and air distribution system shall meet the requirements of Table 402.1.1.
- - - TABLE 402.1.1 COMPONENT EFFCIENCIES REQUIREDa, l
- - - (see attached)

Jerry, you put a lot in to this, can't thank you enough.