Mortar is vulnerable to deterioration by sulfates especially when masonry is saturated for long periods of time.
Nhbc roofing mortar.
Wet bedded verge tiles or slates should be fully bedded on roofing mortar having a minimum width of 100mm.
National house building council is registered in england and wales under company number 320784.
To reduce risk sulfate resisting portland cement to bs en 197 1 should be used.
National house building council is registered in england and wales under company number 320784.
Nhbc is authorised by the prudential regulation authority and regulated by the financial conduct authority and the prudential regulation authority.
On page 5 specifically addresses mortar placement to verges which nhbc has seen to be susceptible to the effects of freeze thaw action.
In cavity walls over openings air bricks and the like.
Nhbc s registered address is.
Nhbc house davy avenue knowlhill milton keynes bucks mk5 8fp.
Following meetings with nfrc research was undertaken jointly to establish the suitability of some alternative proven mortar mixes for roofing applications.
General wall area above dpc.
Nhbc is authorised by the prudential regulation authority and regulated by the financial conduct authority and the prudential regulation authority.
All colors in stock lowest prices quick shipping.
The outcome of this research is that nhbc has up dated the mortar mix for roofing.
Nhbc house davy avenue knowlhill milton keynes bucks mk5 8fp.
150mm above adjoining roof surface to link with the roof upstand.
Mortar designation to bs en 1996 1 1.
The proportion of sharp sand should not be less than one third of the total sand content proprietary mixes may be accepted by nhbc where they are shown to have similar strength durability and workability.
Chapter 7 2 pitched roofs page 12 s12 b includes the following guidance.
The cavity tray should fully protect the opening.
Nhbc s registered address is.
The mortar should be a mix based on sharp sand with soft sand added to achieve workability.