Kingspan Flat Roof Insulation Between Joists

Last year we bought a barn that was converted in the 1980 s.

Kingspan flat roof insulation between joists.

With solutions ranging from our optim r vacuum insulation panels to our therma range of pir insulation we can provide the best solution for flat roof insulation for roofs with mechanically fixed bonded or torch applied waterproofing systems. Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation. It is preferred to have the bulk of the insulation between the joists to reduce any risk of condensation. A cold deck flat roof will typically require insulation to be installed between the roof joists to comply with building regulation requirements.

Between and under joists. We also have insulation boards suitable for more specialist roof applications for example inverted roof insulation and balcony insulation. A cold flat roof is one where the insulation is between or between and below the roof joists. Roof insulation between joist.

The rule of thumb for foil faced boards like thermapitch tp10 or kooltherm k7 in this scenario is that you can have no more insulation under the joists than you have between the joists. This is used for refurbishment e g. It is important to make sure that there is at least 50 mm airgap for ventilation above the insulation and the roof deck to prevent condensation occurring. Cold roof insulated plasterboard vapour barrier membrane insulation between joists eg kingspan tp10 50mm air gap above the insulation then roof deck eg plywood and then waterproofing membrane.

In your situation your roof deck is the fibre glass grp applied to plywood. Unless the joists are exceptionally deep there is also likely to be a requirement to install insulation to the underside of the joists as the upper 50mm of joist space is usually required to be left clear for ventilation purposes. Our range of high and optimum performance flat roof insulation products are suitable for use in a range of flat roofs. If you put insulation under the decking and between the joists you lower the temperature of the decking and lower the due point thus bringing it closer to the danger point of being in the building.

It allows insulation to be added without having to replace the waterproofing on the existing roof or raising the roofline. We have a wide range of roof insulation products including flat roof insulation tapered insulation and pitched roof loft insulation. Refurbishing an existing timber joisted flat roof which has no insulation. The insulation is below the deck but above the plasterboard.

It already has foil backed insulation in the roof but only 35mm and we would like to increase this without taking the roof off as it s simply too expensive.