Steel straps with a galvanized finish are normally acceptable.
Nhbc warm roof detail.
The upper trafficked surface of the balcony.
The design should detail how straps are to be fixed and what materials are to be used.
Flat roofs and balconies shall support and transmit loads safely to the structure.
Where the roof pitch is 15 or more ventilation equivalent to a 10mm slot running the full length of the eaves should be provided.
National house building council is registered in england and wales under company number 320784.
7 1 appendix 7 1b surface treatments.
Nhbc house davy avenue knowlhill milton keynes bucks mk5 8fp.
Appendix 7 1 c includes typical details for flat roofs and balconies.
Roofs should be designed by an engineer in accordance with technical requirement r5 where.
For technical advice and support call 01908 747384 or visit www nhbc co uk in this issue.
Nhbc s registered address is.
Be produced by an engineer in accordance with technical requirement r5 and be in accordance with bs en 1991 1 1 bs en 1991 1 3 and bs en 1991 1 4.
Insulated above the deck.
Nhbc standards chapter 4 4 formerly ch 4 5 raft pile pier and beam foundations.
Where the ceiling follows the slope of a roof regardless of pitch or where a cold roof has a pitch less than 15 ventilation equivalent to a 25mm slot running the full length of the eaves should be provided a nominal clearance of 50mm should be maintained.
Balcony access weatherproofing and drainage.
Raft foundations edge detail.
7 1 appendix 7 1c construction details for flat roofs and balconies.
Introducing revised chapter 7 2 pitched roofs page 1 pitched roofs a high proportion of claims page 1 roof mortar page 2 mechanical fixing of ridge and hip tiles page 3 dentil tiles in ridges and hips page 4 interlocking tiles page 4.
Inverted warm roof inverted concrete deck.
7 1 appendix 7 1d.
Systems may be used at a greater pitch where they meet the requirements of this chapter and materials are adequately held in place.
Where holding down straps are necessary they should have a minimum cross section of 30mm x 2 5mm and be fixed at maximum 2m centres.
The structural substrate of the flat roof.
Warm roof concrete deck warm roof timber deck warm roof profiled metal deck inverted warm roof concrete deck intensive green roof extensive green roof.
The structural design of flat roofs and balconies should.
Foundation concrete steps in foundations strip and trench fill foundations on level sites.
Some roof covering manufacturers provide detailed guidance.
Appendix 7 1 a shows the three flat roof constructions acceptable to nhbc with variations for timber and concrete structural support.
Warm roof concrete deck timber deck profiled metal deck.
Nhbc standards chapter 5 2 suspended ground floors.
Nhbc standards chapter 4 3 formerly ch 4 4 strip and trench fill foundations.
