Gable end - timber vs Thermalite block

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Hi, first timer on here…hoping for some advice.

We’re currently converting our flat roof single attached garage (3m x 7m) into living accommodation, with pitch roof to join existing bungalow roof (so it looks all as one).

Existing end wall is 7m long and is 6” single skin block work without piers. Our builder wants to carry on and build the gable in 6” concrete block work, but we are concerned that it will make the wall too high (especially without piers).

Does anyone have any advice on timber vs Thermalite blocks for the gable, as they are less weight, instead of 6” concrete block work?
Thanks
 
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your original timber frame idea was safer, with cement board and thincoat render. Or
You could frame and insulate it and clad the whole wall with pvc shiplap or similar .
 
Thank you. We are looking to do the gable end in timber definitely now. Can you fit the render board straight to the OSB, with a breather membrane, or do you have to use 25 x 50mm battens? We would prefer to put the render board straight to the OSB - is this ok?
 
Thank you. We are looking to do the gable end in timber definitely now. Can you fit the render board straight to the OSB, with a breather membrane, or do you have to use 25 x 50mm battens? We would prefer to put the render board straight to the OSB - is this ok?

it should have 50 x 25 batten behind, the cavity allows airflow and stop build up of damp.
 
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Thank you. So the timber gable will sit on the existing 6” block end wall - we want to finish with render over the whole end wall (timber gable end and block work under) ie have a flush joint. Everywhere we’ve looked online, shows the battens with the board and a gap at the bottom - but we would like to achieve a flush wall. So there is almost no point having the battens….are we really likely to get sweating and moisture?
 

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