Roof insulation system and method of fabrication therefor

A roof system for a building roof having in place roof supports comprising a plurality of parallel and spaced apart elongated structural support units having an uppermost longitudinal surface defining a roof support plane thereon exposed from above, said roof system comprising:

• (a) a vapor barrier comprised of a plurality of joined section lengths of moisture impervious flexible sheeting extending longitudinally supported over the roof support plane surfaces of said structural units to span the intervening space therebetween substantially taut and unsupported thereover, said sections including first section lengths overlying over adjacent of said units so as to cover intervening spacings between said units while omitting coverage between adjacent of said first sections, and second section lengths longitudinally extending in an overlapping relation with the border portions of adjacent of said first section lengths,:
• (b) substantially continuous insulation overlying said vapor barrier sheeting;
• and
• (c) hard roofing overlying and adjacent to said insulation and secured to said structural units.

A method of fabricating a roof for a building having in place a plurality of parallel and spaced apart elongated structural support units having an uppermost longitudinal roof support plane surface exposed units having an uppermost longitudinal roof support plane surface exposed from above and comprising the steps of:

• (a) unrolling individual lengths of flexible moisture impervious vapor barrier sheeting from a source roll of said sheeting in the longitudinal direction of said support units for placing the sheeting onto the exposed roof support plane surface of said units substantially taut and unsupported therebetween;
• (b) joining adjacent of said individual lengths longitudinally in an overlapping seamed relation with each other;
• (c) applying substantially continuous insulation overlying said vapor barrier sheeting;
• and
• (d) securing a hard roofing to said support units in adjacent overlying relation to said insulation.

A method of fabricating a roof for a building having in place a plurality of parallel and spaced apart elongated structural support units defining an uppermost longitudinal roof support plane surface exposed from above and comprising the sequential steps of:

• (a) sequentially unrolling individual lengths of moisture impervious flexible vapor barrier sheeting from a source roll of said sheeting in the longitudinal direction of said support units for mounting onto the exposed roof support plane surface of said units substantially taut and unsupported therebetween, said lengths being unrolled in a laterally spaced apart relation followed by unrolling a length intermediate and in border contact with said spaced apart lengths;
• (b) applying substantially continuous insulation overlying said vapor barrier sheeting;
• and
• (c) applying a hard roofing over said insulation.

A method of fabricating a roof for a building having in place a plurality of parallel and spaced apart elongated structural support units defining an uppermost longitudinal roof support plane surface exposed from above and comprising the sequential steps of:

• (a) unrolling a first length of flexible moisture impervious vapor barrier sheeting composition from a source roll of said sheeting in the longitudinal direction of said structural units for mounting onto the longitudinal roof support plane surfaces of some of said units while covering a first intervening space therebetween substantially taut and unsupported thereover;
• (b) unrolling a second length of flexible moisture impervious vapor barrier sheeting composition from a source roll of said sheeting in the longitudinal direction of said structural units for mounting onto the longitudinal roof support plane surface of others of said support units while covering a second intervening space therebetween substantially taut and unsupported thereover and while omitting coverage of a third intervening space laterally separating said first and second intervening spaces;
• (c) unrolling a third length of flexible moisture impervious vapor barrier sheeting composition from a source roll of said sheeting in the longitudinal direction of such structural units for covering said third intervening space substantially taut and unsupported thereover by mounting said third length into an overlapping relationship with the border surfaces of said first and second lengths to form with said first and second lengths a continuous uninterrupted vapor barrier providing spanned coverage over said first, second and third intervening spaces;
• (d) applying substantially continuous insulation overlying said vapor barrier sheeting;
• and
• (e) securing a hard roofing to said support units in overlying and adjacent relation to said insulation.