Installing hard foam thermal insulation boards on the facade walls is a great way to double the thermal performance of your building and eliminate air leaks.
Large rigid foam boards, attached to walls or roof, well sealed with silicone and specialty straps, can be installed over or instead of existing insulation.
Hard foam boards are made of polyurethane (PU) base and can have additional double sided protection in the form of aluminum foil and toronto spray foam contractor will give you what you need.
Note: Polyisocyanurate (PIR, polyisocyanurate, polyiso, ISO) is actually an improved polyurethane (PUR). The level of methylene diphenyl diisocyanate (MDI) is higher than that of ordinary polyurethane, and instead of polyether polyol, polyester polyol is used in the production process. The catalysts and additives used for PIR are also different from those in PUR foams.
Basic tips for installing hard foam boards
Regardless of the type of object you insulate, the characteristics and durability of the wall will depend on the way the panels are connected to the rest of the wall. The screws must be long enough to pass through the moldings on the outside, the foam panels, and to retrieve the wooden structure of the object.
The boards themselves should rest firmly against each other, and all joints and edges must be tightly sealed to prevent air and water leaks. The key to a successful installation is spotting all the breakthroughs and choosing the best way to seal them. Five key details should be enough to get this job done well.
1. Protection of the lower edge of PU panels
Many contractors protect insect foam at the bottom corner where the insulation begins by simply gluing over the edges of the panels the tape that arrived as a carpentry guard.
Joyce recommends metal profiles (galvanized steel or aluminum) that will serve as protection against insects, wind and water. The steam that collects inside the wall will flow through this profile outwards, away from the foundation walls. These metal profiles are additionally secured with silicone adhesive and nails.
2. Boxes around windows
The openings use additional window boxes made of plywood. The main role of these boxes is to align the window opening, and to provide a hard surface for bonding the sealing tape.
From the outside, make sure that these boxes are flush with the line as long as the foam boards will come. During construction, it is important to keep an eye on the position of the structure and the size of the windows in the specification in order to leave room to place these boxes.
3. Attachment of hard foam panels and facade substructure
It is practically impossible to install slats that will hold the PU panel sheath on the outside and will serve as a substructure for the façade unless the panels are firmly in place. Therefore, in addition to the adhesive, temporary screws with wooden washers are used for each hard foam board separately – not on the joints because the joints should be fitted with slats.