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For anybody that may have similar question. These are the useful and informative answers received on other forums All unvented should be fitted with a 2 port motorised valve. Linked through the cylinder controls.( normally supplied with cylinder. Nearly all will come with a factory fitted...

Hi Dan, If you are not interested in helping or have nothing useful to add to the discussion or conversion probably best not to take part in the discussion or conversation. I asked "why do some unvented packs not have a cylinder thermostat included? are the motorised valve the same in vented...

thanks Dan for your reply. Just to be clear I am not a plumber or a heating engineer or do I intend to upgrade the system myself. I have read enough to understand the difference between vented or unvented systems. The reason I posted was to hopefully get a better understanding of what is in...

Looking to upgrade with s type control pack to control hot water and rads separately and would like to know the difference between the available control packs for vented and un-vented. i understand the difference between vented and unvented system but what is the difference between the...

Thanks woody for your reply. I was aware of thermal bridge, the engineer advised to close the cavity with a block as a fire barrier, so just looking for the best option with the thermal bridge.

Hi, Have a block cavity wall extension waiting for roof to go on. Just wondering what the best option is for rafter tails. (sketch attached) The roof angle means the tails of the rafters will cut through the cavity wall closing block. Looking at it seems to make sense to me to cut the rafter...

Yes indeed very poor. Looks like it may have gone off on 1 wall I'll get it rebuilt better to sort it now than deal with the knock on effect Thanks for your helpful reply.

Hi, Thanks for the reply I have uploaded image on link below. https://dl.dropboxusercontent.com/u/187743/foundation.JPG [/url]

Extension

Is it is easy to recover 50-60mm? Solid block footing 320mm wide just went in on new house extension and parallel walls are off square by 50-60mm Foundation is 900mm wide -footing are solid block (215x440x100mm) next part of build is cavity wall on top of footings = 2 x 100mm blocks...