Effect of insulation joints on heat loss through flat roofs

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Journal titleASHRAE Transactions
Pages60822; # of pages: 587
SubjectRoofing; heat transfer; heat losses; flat roofs; thermal insulation; joints (junctions); heat flux transducers; plywood decking; extruded polystyrene; Heat performance; Couvertures; transfer de chaleur; déperdition de chaleur; toiture terrasse; isolation thermique; joint (liaison)
AbstractIncreased heat loss has been measured for several insulation joint arrangements in extruded polystyrene placed on a 9-mm thick plywood deck. Butt joints ranging up to 25.4 mm wide, a 3-mm butt joint bevelled to 28 mm at the deck, and a 3-mm shiplap joint were used. Most of the work was carried out with protected-membrane roof arrangements, but measurements were also made on a conventional roof arrangement with 2.5- and 12.7-mm butt joints. Sets of two and six heat flux transducers were placed at the underside of the deck at various locations with respect to the insulation joints. The measured heat fluxes were used to estimate heat flux as a function of distance from the joint and from this to compare heat losses with and without joints.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number27996
NPARC number20377958
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Record identifier81214928-75e2-485b-8343-053ecfe62b72
Record created2012-07-24
Record modified2016-05-09
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