Wall, floor, and roof build layers
A little background.
Starting construction on a small house in Texas, west side of Houston,
Climate zone 2A – wet & humid
Conditioned living space is 1280 square feet
House is being built in a FLOOD WAY, Yes I said in a FLOOD WAY
We already have approval to do this, which has taken us quite some time to accomplish.
House will be elevated approximately 6′ off the existing grade on concrete filled
fiberglass pipes with re-bar reinforcing inside. I have designed a steel collar, plate, &
C-channel attachment system that our engineer is comfortable with.
House is being built on a very limited budget, with as much recycled material as possible.
and lots of personal labor.
Have some (many) questions on building design I see most questions for climate zones
north of where iI live, very few for my area.
1st is wall construction.
House to be insulated on exterior with rigid polyiso insulation board, 2×6 studs
Exterior sheeting will be recycled corrugated sheet steel.
What is the best way to construct the wall from the outside moving towards the inside?
Exterior sheet steel
House wrap DuPont Tyvek Commercial Wrap D ( to keep furring strips dry) or tar paper ?
2 layers of 2″ rigid polyiso insulation board ( which facing material ? )
Structal wall support, wrap complete house or just corners with 4 x 8 plywood or other method
2 x 6 studs cavities filled with pink insulation Faced insulatio OK here ?
NO VAPOR BARRIER
1/4″ drywall taped & floated ( This will be air permeability ? to allow drying to the interior ? )
non latex paint, or wood accented walls
This will dry to the interior
2nd is floor
Per our engineer we will be using 1-1/8 x 4 x 8 Tongue-and-Groove OSB Sturd-I-Floor
due to joist decision.
Floor Insulation question.
Will I be safe to use a insulated nail base product over the sub-floor to insulate the floor ?
3rd. is the roof
Simple straight shot gable roof, 36 feet in length, leaving 2 feet overhang on both the east & west ends of house, Non vented roof
New material for roof over conditioned living space.
This will be an open cathedral with rafter over the ridge beams
( 2 @ 6″ X 16″ ) with 3 supports. No can lights, Only openings penetrating the roof will be
a wood stove pipe and a vent pipe.
Interior to be exposed rafters, exposed wood & metal interior ( think rustic )
Should this be the same design as the walls
Outside to inside
2 layers of 2″ rigid polyiso insulation board taped& caulked ( again which facing material ? )
plywood or ? a mix of 1 x 4, 1 x 6, ( think cheap, recycled material )
From this point I am confused on how to end up with the desired interior look, along with the
air barrier without using drywall on the interior.
I will be happy to clear up any question that are sure to come.
Thank you for taking the time to help /point me in the CORRECT approach.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part