There often appears to be confusion about when a flat roof requires thermally upgrading as part of a programme of repair or refurbishment works. As far as building regulations are concerned, some repairs to flats roofs will not require an application for approval under the Building Regulations. However, if the roof with integral insulation is to be replaced then you may be required to upgrade this ‘thermal element’ of the structure and reduce the amount of heat that was originally lost, by upgrading the insulation.
Wherever possible, the physical stripping up of a roof to thermally upgrade should of course be avoided so as to avoid full exposure of the building and its contents to weather and probable water ingress with consequent damage. As outlined previously, the advantage of applying liquid roofing systems OUTSIDE of a building – particularly in refurbishment situations – is the building and occupants below can carry on with normal day to day operation without the need for disruptive works internally. There are of course some situations where the existing insulation beneath the existing failed waterproofing may have become so damaged due to saturation that is does require complete replacement
When a roof’s thermal upgrade IS required, this can of course still be carried out utilising a liquid-applied roof re-waterproofing system n the same was as outlined in our ‘Built-UP Roofing (BUR) section. As part of the process, the designer needs to determine – amongst others – the thermal (‘U Value’) of the roof. Ordinarily, new insulation (cut to falls if necessary) can be installed ON TOP OF the existing roof system thigh this is dependant on other roof detailing and lines (such as rooflight levels, height of upstands, position of drainage & gullies etc).
In any event, Cemplas can assist fully prior to the works being carried out in determining the appropriate solution for your needs working in conjunction with our liquid-applied roofing system suppliers.