Why insulate your roof?

Insulation and condensation control are very important factors within a flat roof. We find that the insulation standard in the average domestic flat roof is generally very poor.  It is the most easily neglected  and under-rated aspect of a flat roof.  Part L of the current Building Regulations state a minimum insulation value for a roof, whether it’s new or a replacement.  Up to 80% of the your homes' heat loss occurs through the roof,  and with heating fuel costs going up at an unprecedented rate, making sure your flat roof insulation is up to standard has never been more important. 

As our homes become more 'airtight' with less natural ventilation, condensation control is more important than ever.  Interstitial condensation occurs when warm, moist air from the room below rises to a cold roof deck. Kitchens, bathrooms and bedrooms are the highest risk rooms for interstitial condensation to occur in the roof void.  Commercial kitchens and swimming pools require special considerations.


What Insulation options are available?

There are two ways to insulate your flat roof: the 'WARM ROOF' method or the 'COLD ROOF' method.

The warm roof method has the main advantage of having the insulation installed ABOVE the roof deck but below the waterproofing. This method ensures that the roof deck is insulated from the cold outside elements and thus prevents interstitial condensation from occurring on the underside if the roof deck as it is kept at the same temperature as its surrounding building materials. This also means that there is no need to ventilate the ceiling void.

The use of polyurethane insulation boards of a suitable thickness allows us to ensure that the required thermal insulation value required by Part L of current Building Regulations is met.

There are some situations where a 'warm roof' simply cannot be installed for various reasons and this is when we would consider using the 'cold roof' method.

The cold roof method places the insulation within the ceiling void, usually between the supporting timber beams. Condensation must be ‘vented out’ by leaving a gap between the top of the insulation and the underside of the roof deck together with strategically placed vents to allow a free flow of air which will pick up and carry out the condensed water.  


Contact us for a FREE, No Obligation Inspection & Quotation Service for advice on which system is most suited to your roof.


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