Nick Posted September 7, 2020 Share Posted September 7, 2020 Forgive the stupid question but when you're trying to achieve an airtight build, what is the typical thing to do with external blockwork that is going to be covered with cladding (let's say timber cladding over medium aggregate block)? Would you parge/seal the blockwork in any way before putting the battens on to help water resistance / airtightness? Link to comment Share on other sites More sharing options...
nod Posted September 7, 2020 Share Posted September 7, 2020 4 minutes ago, Nick said: Forgive the stupid question but when you're trying to achieve an airtight build, what is the typical thing to do with external blockwork that is going to be covered with cladding (let's say timber cladding over medium aggregate block)? Would you parge/seal the blockwork in any way before putting the battens on to help water resistance / airtightness? As a business I put hundreds of bags of the stuff on Most is for sound Its pretty pointless for airtightness But definitely not necessary on the exterior block Link to comment Share on other sites More sharing options...
tonyshouse Posted September 7, 2020 Share Posted September 7, 2020 Is it solid or cavity wall, where is the air tightness barrier? Link to comment Share on other sites More sharing options...
Nick Posted September 7, 2020 Author Share Posted September 7, 2020 Cavity wall, airtightness barrier would be the internal wet plaster finish. Ground floor would be rendered and First floor would need cladding to match existing. If there's no benefit to treating the external face behind the cladding then fair enough - just seems odd to leave it bare when there's so much emphasis generally on sealing up blockwork to keep wind/water out. Link to comment Share on other sites More sharing options...
tonyshouse Posted September 8, 2020 Share Posted September 8, 2020 Sand and cement slurry and a broom - I would do it Link to comment Share on other sites More sharing options...
Oz07 Posted September 8, 2020 Share Posted September 8, 2020 Waste of time i'd of thought. If it gets as far as into the cavity you're knackered anyway Link to comment Share on other sites More sharing options...
Nick Posted September 8, 2020 Author Share Posted September 8, 2020 7 minutes ago, Oz07 said: Waste of time i'd of thought. If it gets as far as into the cavity you're knackered anyway Sorry, ya lost me? I'm asking about parging the outside face of the external block with a view to keeping airflow and water out of the cavity... Link to comment Share on other sites More sharing options...
Declan52 Posted September 8, 2020 Share Posted September 8, 2020 It won't do any harm but won't improve airtightness. It will however stop any rain getting into the cavity which would help. It's an easy but very messy job to do so if you have the time then fire away. Link to comment Share on other sites More sharing options...
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