Insulation would normally be placed in the lower portion of … Traditionally, flat roofs simply consisted of a structural timber deck with a waterproof covering directly applied to the top of the deck. My builder who I have to say was good, fitted a loft conversion with what I now know is a cold deck roof. This type of roof has normally been used over small extensions to dwellings using timber joists and plywood deck; because the waterproofing layer constitutes a vapour control layer on the cold side of the insulation, there is a high risk of harmful interstitial and surface condensation on the underside of the deck or the upper surface of the insulation. %���� Warm Deck Roof With this type of roof the insulation is placed above the roof deck but below the weatherproofing. I will get you…Dominic Hayes – Group property Director – Nuffield HealthI am writing on behalf of Thorntons Plc to thank Bradley Mason for the excellent works carried out to our…Richard Booth – Building and Services Manager – Thorntons PLCJust a quick note of genuine thanks for a great piece of work, enabling us to achieve our goal! These are cold deck and hot deck flat roofs and as the names suggest the difference is about how the roof handles insulation. 2 0 obj Ventilation is required for these roofs. It is universally recommended that cold deck flat roof construction should be avoided. J j�^��iw\̒'�� q�,�O� GN2+ nH��o=���TN�����_��Fv��M��F���f����N�W�M�5��i��IU�$=ΞfM�s ��9A�ai=) ����N�Z���G"h]�;oU��K4��?_$����be� Some forms of roof decking may also have insulation bonded to them. My Sika  There should be no insulation below the deck and no ventilation is required. Cold deck roof: The insulation in a cold deck roof is installed at ceiling level, therefore the void is at a colder temperature than the room below during colder weather. What is a cold roof? Contrasted with the cold deck roof, this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof. Favourite Products Cold Deck – this is where the insulation is placed between the joists/rafters or in between the ceiling joists in the case of a pitch roof. Document Basket <> Warm Deck – this is where the insulation is placed on top of the rafters/joists and the roof covering is then placed over the insulation. This ‘cold deck’ construction is considered problematic in the humid, temperate climate of the UK where the effective ventilation of restricted roof voids may be impractical, particularly in sheltered, built-up areas. %PDF-1.3 Furthermore, an Inverted roof is a different type of warm deck roof, where the insulation is installed above the membrane and so no vapour control is needed. Minimum 25mm deep timber battens support the ceiling, will provide a suitable service void necessary to enable cables and pipes to be installed without penetration of the AVCL.Cold roofs are generally considered ineffective for energy use reduction and building performance and providing adequate ventilation is extremely problematic. Sarnafil membranes can be used in cold roofs but we strongly advise these should be avoided in the first place.   This advice is also supported by the latest SPRA Design Guide and current  version of  ‘BS 6229:2018 Flat roofs with continuously supported flexible waterproof coverings – Code of practice’, which also states that
So what exactly is a cold roof? In a cold roof construction, the Sarnafil membrane is installed directly to the structural decking (usually timber with firrings to fall).
There must be an adequate void (minimum 50mm) between the deck and the insulation (traditionally mineral wool) to allow free movement of air, and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof construction, causing harmful interstitial and/or surface condensation (interstitial condensation). These two airflows are then mixed together to create the right amount of heating and cooling for each space. Which makes sense, as this space is otherwise empty, and so it’s a simple, low-impact way to insulate a roof. It turns out though that it was not done correctly and the Celotex was pushed to the underside of the roof and not the top of the ceiling. �A^�e����ɸ����KP��{Y�B"u�tߣ��B���P�%�D��S�rĘ\h� ���S�sX���?�rJ�ty�iTK0��J�ؒd�������rJ�^���$�V"�[v�~���ؤ�8�B �o�Ay�WĿ��_��ɔ� �S%��iH� ,Q����e�BN�����ʓz>����$�$}�������A:R���K��&I�Or�˞�g�NL�.^�D���$h\�p��S}�|�o����]זӝ��NV����O�GQ�E��i����E�'��W�����H6%D�3^�z��E�,�������8�nN�(�8�ߔ+2�d~�~�~��Z�~֥����S�%��i����q������_��,�RV7=���a����3y���zwW=�ks^��F.�c������>;�/a�����,y�1��_G`q��� %��������� << /Length 4 0 R /Filter /FlateDecode >> Consequently, it is important that the void is well ventilated. Really…Copyright © 2020 Bradley-Mason LLP.


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