The Isoquick insulating formwork is laid
March 15, 2014
This weekend we had 4 of our good friends over to help us lay the Isoquick insulating form work system, which we did over 2 days.
First we set out the perimeter using builder's line from the corner rails that the ground works contractor had set at finished floor level for us last week using his laser level.
The next step was then to lay the large polystyrene Isoquick insulation blocks in place, starting with the 4 corners and specially shaped edge modules to establish the perimeter. This is done from the outside so as to avoid disrupting the fine 6mm gravel layer too much.
Each of the pieces interlocks into the next with a pair of tongue & groove style joints, so you simply work around the building in one direction interlocking as you go. We had an additional 50mm piece glued to the top of the standard edge module to accommodate our 300mm thick raft foundation slab. As you can see this was not glued perfectly flat so we also checked for level on the egg-crate module surface at the base. We also checked for square at the corners and measured the diagonals.
After the perimeter has been completed the centre is filled in. We began with the 200mm thick rectangular modules which are laid with the egg-crate side facing upwards to match the edge modules. Then the 100mm thick rectangular modules are laid the other way up over the whole area and the two layers interlock. We had to do some finer levelling of the gravel layer as we went along to make sure that the modules were firmly bedded as this is how the loads will be distributed from the building to the ground.