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Posted by Andy Energy on April 30, 2008, 12:51 am
> about to order the floor joist system for my house, and have been
> hearing different things about
> open-truss-systems: they sound like having a drum under/over you, or:
> they will make your
> plumber/electrician (me.) weep with joy. any direct experiences? any
> downside to wood-I (TJI)?
Regardless of what you use be sure the perimeter is air sealed and
properly insulated. This is an area of infiltration and heat loss/
gain that once it is covered will be there for the life of the
structure.
Proper installation on insulation is more critical than what type. NO
voids or gaps (one would not buy a winter jacket with holes), crushing
in as few places as possible and no more than 50% of the depth of the
insulation.
Unless spay foam is used infiltration will not be stopped or reduced.
Be sure your contractor subscribes to Whole House Performance
(Building Science). A few dollars now will save many later.
A properly insulated house with a properly sized HVAC system can have
utility bills 60-80% less than a conventional built house. And if one
checks the national building code this is house houses are to be
built. I can assure you they are normally not.
Andy
Whole House Performance
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