Foundation is prepared and poured by a formwork contractor under the oversight of the owner or building site manager. The dimensions need to follow the blueprint precisely because the panels are precast according to very specific dimensions.
The general contractor assembles the top bearing joists on the foundation in the conventional manner.
It is set on top of the foundation by the general contractor. See note 1.
An installer duly authorized by Avac Beton checks the level of the foundation with a laser. The level is adjusted temporarily with sheets of high density polyethylene according to the future placement of the panels. See note 2.
No worries – Avac Beton coordinates between the delivery, the crane and the installation team. That way, all ground floor panels are delivered and installed upon the foundation professionally. The installation team then sets a non-shrink mortar underneath the panels.
In a single-storey building, rafter brackets precast by Avac Beton or a sill plate anchored to the top of the panels are used to position the roof rafters. In a multi-storey building, the joist brackets precast by Avac Beton are installed at the top of the panels and used to assemble the joists to the panels. The general contractor takes care of this step. See note 3.
Once the first floor is placed, the second floor panels are installed over it, and so forth, up to three-storeys high. Afterwards, the general contractor builds the roof and protects it with the selected roof shingles.
A wood or light steel structural frame (2” x 4”) is set 3” behind the panels. It is anchored to the floor and ceiling. See note 4.
Doors and windows are installed and attached to the inside structural frame by their manufacturer or by the contractor.
An insulation contractor sprays a 4-inch layer of polyurethane foam in between the wood or light steel studs and around the doors and windows. The polyurethane foam sets, as it were, the different components together. It is not necessary to add an additional air barrier or vapor barrier membrane. See note 5.
A professional seals the exterior joints between the panels and around the doors and windows using Dymeric® or another silicone sealant. This work is supervised by the building site manager or the general contractor.
The following construction steps proceed according to conventional methods. The electrician, the plumber, the home automation technician and HVAC contractor will all perform their mandate before the walls are closed up with gypsum boards. Afterwards, the selected contractor can proceed with the finishing work.