Static structures (e.g. – buildings) – Insulating insert; e.g. – filler in cavity in preconstructed... – Filler spaced from inside face of cavity
Patent
1998-08-20
2000-09-19
Stephan, Beth A.
Static structures (e.g., buildings)
Insulating insert; e.g., filler in cavity in preconstructed...
Filler spaced from inside face of cavity
5274212, 524062, 524044, E04B 174
Patent
active
061194247
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to insulation formed of mineral wool provided in roll form and its use to insulate spaces between parallel joists and which minimises cold bridging effects.
It is well known to provide insulation formed of mineral fibre wools, for instance glass wool and rock wool, in roll form. It is known to provide the roll such that the batt of mineral wool is of a suitable width for fitting between joists, for instance ceiling joists in lofts, positioned at standard distances for instance 400 mm centres or 600 mm centres. One product which has been available for some time comprises a 100 m thick and 570 mm wide material wound into a roll. This provided adequate insulation to meet minimum requirements in the past. Building regulations have been increasing the requirements for minimum insulation and calculations of the insulation performance or "U values" must take into account the effect of thermal bridging at mortar joints, timber joists and studwork. This has meant that thermal bridging at ceiling joists should be minimised.
One way of improving the U values is to use thicker insulation between the joists, for instance 150 or 180 mm. However with the standard width roll the, even where the joists are of a lesser depth than the thickness of the insulation, cannot prevent thermal bridging. A roll formed of 150 mm thick homogenous batt can be adequately pushed between the joists to fill the gap, but the upper portion, extending above the joists cannot overlap the joists adequately to provide insulation above the joist.
Whilst increasing the thickness of a standard rectangular section batt to around 180 mm would provide adequate U values, single thickness of loft insulation greater than the height of the joist results in the insulation being compressed in thickness when it is installed under bracing timbers which are typically nailed across the tops of the ceiling joists to aid roof stability.
One solution to this problem is the Rockwool EnergySaver Super 150 mm loft insulation. This consists of a double layer of mineral wool wound in a single roll. The bottom layer is 100 mm thick, whilst the top layer is 50 mm thick. The roll is unwound in the normal manner so that the bottom 100 mm layer fits in the gap between joists. The top 50 mm layer is subsequently loosened and re-positioned by moving it sideways so that it overlies a joist. Top layers of adjacent strips are positioned so that their longitudinal edges abut one another. Since the roll is narrower than the distance between the joist centres (in order that the bottom layer fits between the joists) at least one additional strip of the top layer is required to cover the entire area over the joists. The two step laying procedure is, in addition, time consuming.
Another way of overcoming the problem of thermal bridging is disclosed in U.S. Pat. No. 4,303,713. The insulating material is again provided as two components. A first relatively wide length of insulating material has elongated slits and notches which act as scores to allow the strip to be folded into a U-shaped configuration so as to line the gap between joists. The top arms of the U can be folded over to form flanges on each side which overlie the joists and, optionally, overlap with the corresponding flange on the strip positioned in the adjacent space between joists. Into the U-shaped cavity is unrolled a second insulating layer. This solution is even more complex than the preceding one as it requires separate positioning of two different types of material and furthermore the provision of slits and notches increases the manufacturing complexity.
Another solution is disclosed in CA-A-1091886. A roll of material has a substantially T-shaped cross-section such hat the base part of the T sits between the joists, whilst the top flange sections extend over the top of the joists. The T-shaped batt can be made either by cutting notches along the longitudinal edges of a rectangular section batt, or may be made by lying a wider strip centrally on top of a narrower strip. Both methods of
REFERENCES:
patent: 4151692 (1979-05-01), Holcombe
patent: 4303713 (1981-12-01), Clemensen et al.
patent: 5508079 (1996-04-01), Grant et al.
patent: 5545453 (1996-08-01), Grant
Martin Raymond William
Osmond Christopher
Dorsey Dennis L.
Rockwool Limited
Stephan Beth A.
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