flat roof insulation

 

FLAT ROOF INSULATION SYSTEMS

By adding flat roof insulation systems which comply with Part L building regulations you will transform your flat roof to be more energy efficient, saving you money and fuel costs in the process whilst also making your property much more comfortable by keeping the heat in during winter and keep the heat out during summer.

Since 2006 and the implementation of approved Part L documents (Conservation of Fuel & Power) an existing flat roof has been required by law to comply with rigorous u-value targets, based on any refurbishment of more than 50% of the existing flat roof. For new build applications it will also be necessary to ensure your flat roof is insulated to the appropriate u-values and meets the approval of your local building control.

WHAT TYPE OF FLAT ROOF INSULATION SHOULD I CHOOSE?

Traditional mineral wool insulation products have been used for many years however these types of products do not offer the highest levels of performance that is demanded by the latest Part L building regulation documents.

By investing in better performance insulation the customer should be able to notice a significant comfort benefit as soon as their new insulation is fitted. More advanced PIR type insulation more commonly known as kingspan, although available in several leading brands such as Ecotherm or Celotex can deliver higher performance insulation when installed in a warm roof configuration.

The diagram below shows PIR insulation installed as a warm roof deck where the insulation is fitted as a continuous sheet above the roof joists, this eliminates the thermal bridging effects caused within a cold roof where the insulation can only be fitted within the gaps between the roof joists causing heat loss through the roof timbers.

flat roof insulation

 

COLD ROOF v WARM ROOF

Understanding the concepts of flat roof construction is essential to building a new flat roof or when refurbishing an existing failed flat roof. Since 2006 and the implementation of Part L building regulations (conversion of fuel and power) an existing flat roof has been required by law to comply with rigorous U-value targets, based on any refurbishment of more than 50% of your flat roof. For new build applications to will also be necessary to ensure that your flat roof is insulated to the appropriate Part L regulations by achieving a U-value of 0.18 or better.

Cold Roof v Warm Roof

COLD ROOF CONSTRUCTION
Cold roof constructions are most commonly designed where the flat roof insulation is located between the joists or also between and under the joists. Cold roof constructions require adequate cross ventilation to avoid condensation damage, this can be achieved by either installing ventilated soffits or old fashioned mushroom vents (not recommended).

WARM ROOF CONSTRUCTION
Warm roof constructions utilises PIR rigid (Kingspan type) insulation above the joists, this reduces the effects of the flat roof dew point which in turn reduces condensation risk, by installing high quality PIR insulation which is typically 120mm thick will transform the energy efficiency of your flat roof which in turn will greatly increase the comfort of your home and reduce energy costs. Warm roofs can also be overlaid over existing failed bitumen felt roofs which will avoid the need of stripped down of the existing roof. If your flat roof is located above a bathroom or kitchen extension for example where higher condensation risks are expected then a warm roof construction is highly recommended.

 

CONTROLLING FLAT ROOF CONDENSATION

Often an mis-advised topic regarding condensation in flat roofs but equally important to retain the long term integrity of the flat roof construction and any associated timber work such as roof joists is by correct use of flat roof insulation and any ventilation required.

Most of the older flat roofs we inspect and survey on a daily basis are not ventilated or insulated correctly, this can cause major problems for the building as the damaging effects of condensation. For example if you have an older flat roof where the insulation is located between the joists this is known a cold roof configuration and in such cases adequate cross ventilation should be installed, this is especially important on flat roofs above roofs such as kitchens, bathrooms or above a swimming pool enclosure.

flat roof condensation

 

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flat roof insulation

flat roof insulation

flat roof insulation

 

 

 

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