Conservatories

Building on top of an existing conservatory slab that is 450mm

Anonymous user 3 March 2024 - 3.42 PM

Hi, my wife & I are getting some quotes to pull down our existing conservatory and replace with something more functional to keep the heat down, as well as more modern with a tiled roof, veluxes & a wall on one side, dwarf wall on other side, all glass between piers 3rd side. It’s 4Mx4m sq. One company have recommended building straight onto the existing slab assuming it’s 450mm thick and using a lightweight aluminium roof and timber framed wall & cladding to keep weight down Another company have said they need 1200mm footings and warned us against building on a 450mm slab. As they recommended a timber roof and brick wall. We would really be very grateful for an experienced person’s opinion on the matter as digging up the existing base for a new 1200 footing is going to blow us out of budget. But I obviously don’t want to pay for a new conservatory if it’s going to move at all or if the aluminium tiled roof won’t be as functional at keeping the heat out as a traditional timber & tiled roof. *Many thanks Thanks for your responses DJ, Pal and Taylor. The existing base and conservatory have been there for around 20 years, weve been here 5. One of the dwarf walls butted up to the house seems to have come away slightly as I had to repoint the gap which is about 30mm. Ive not exposed to slab at that point yet so cant comment how sound it is in that section.