winkie Posted April 8, 2017 Share Posted April 8, 2017 Very little nowadays is intentionally built to last.....there are various logical reasons for this...... Quote Link to comment Share on other sites More sharing options...
CCCP Posted November 29, 2021 Share Posted November 29, 2021 CITY & GUILDS N.V.Q. BRICKWORK says "vapour barriers" and "perforated p.i.r. foam boards"and "perforated foils" are NOT for cavity-walls , or plasterboard ceilings ; Because they DO NOT BREATHE NO-WHERE NEAR ENOUGH , they severely retard the necessary rapid moisture vapour transpiration draw from inside the buildings out through the porous substance of both (masonry or timber) walls into the outside atmosphere of the buildings. The moisture vapour build-up inside the buildings ( from body breath vapour , cooking steam e.t.c.) is witheld stagnantly within the porous substance of the inner masonry or timber walls ; making uncomfortable chronic dank , over-moist tepid atmosphere , sweating wall conditions inside the buildings. "B.R.A.C." (building regulations advisory committee (the building advisory team to th U.K. government)) and "N.H.B.C." are misleading the general public into having incorrect builds done. (So the cavity-walls will have to be all completely extracted of the incorrect material ,and the cavity-walls MUST then be left COMPLETELY HOLLOW for it to be a correct comfortable build ; Wheras they could have left the Cavity-walls completely hollow in the first place. Cavity-walls must NOT be abridged by insulation (insulation touching both inner and outer walls) or muffled. IT IS PERFECTLY O.K. TO BUILD WITH COMPLETELY HOLLOW CAVITY-WALLS. If you were to have insulation in cavity-walls, it is only for major cavity-walls in newbuilds from the very start,and only for sheer smooth sided inner cavity wall surfaces. There are only 3 types of insulation BATT : VERY breathable fibreglass , mineralwool or polyester fibre ; thin sheer smooth sided rectangular pieces ,held next to the inner wall in the cavity by clips attached on cavity-wall-tie. There HAS to be a very large air space gap clearance from the face of cavity-wall insulation BATT to the central cavity-wall-tie drip point PLUS a continuation of the air space gap clearance to the outer wall. Timber walls (after 2 coatings of pure unboiled linseed oil) take only polyester fibre BATTS. Double metal skinned cavity-walls , open-band , open-block type walls must NOT have insulation , Masonry walls must NOT be tiled or clad. Roof underside surfaces MUST be of a bare minimal so that a large volume of air circulation against the underside surface of the sarking felt can constantly dry out the condensation-gather that forms on it.There MUST be plenty roof eaves ventilation.The cavity-walls MUST have plenty of ventilation and are ONLY ventilated at the top at the opening of the cavity-walls in the loft . Spaced out battens on spaced out rafters (NOT boards !) sarking felt is inbetween battens and rafters with ½ inch sag in the middle for any water droplet channeling. Ask in person CITY & GUILDS N.V.Q. BRICKWORK , ROOFING or JOINERY about this and any other advice. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.