We received an email with some questions that are very common, and it seemed like sharing the answers could be helpful to others looking into WarmFörm for their projects.
• For utilities, are these generally set in the subsoil prior to beginning the gravel base install or is it best to install utilities within the gravel layer?
• Do you recommend a geotextile layer over subsoil prior to gravel or is this overkill?
• Is there a reason to keep the vapor barrier over the first layer of foam and not over the top layer, or is this just for ease of keeping the vapor barrier flat?
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ByggStik braces with CLT mid rise construction. photo: Jonas Ljungdahl
ByggStik was developed specifically for working with high value building components and rapid building assembly. It is the perfect brace for SIPs, CLT, and other modern forms of construction.
ByggHouse was at the recent Mass Wood Conference in Portland introducing this new product to the North American market. This quickly maturing building system is in process of establishing proper work methods, which good bracing will be part of. CLT construction should have engineered erection documentation that includes the specification of bracing points, determined by calculations utilizing bracing of known load capacity. CLT buildings are going taller, and lateral forces from wind with height is going to be part of building this way. Propping your work with used 2x4s is just not going to suffice anymore.
This WarmFörm slab in Ohio is our first installation of our new Passive House WarmFörm elements. This one features the 6″ vertical face to match with the house’s 6″ thick exterior insulation. More photographs are posted in the project album.
We are preparing to introduce an expansion of the WarmFörm product offering – new face thicknesses to meet the demands of the Passive House standard. These new elements will be available in a 4″ face, 6″ face, and 8″ face. Note these Passive House Elements have no beveled top edge like the standard WarmFörm Elements in order to match up with thicker exterior insulation layers in wall assemblies. R value varies per temperature, but the foam manufacturer’s Design Thermal Resistance per inch for this Type IX foam is R 4.8/inch. So face R value at 40deg F for these Elements is 4″ R19.2, 6″ R28.8, & 8″ R38.4.
For this installation the customer is an experienced contractor trying WarmFörm for the first time. Located in the Catskills region of NY state, for this site they are avoiding digging down for a 48″ frost line. Read more ›
Concrete pour happening this day for another WarmFörm frost protected slab-on-grade in NY state.
Greg and I are often asked to explain how “closed walls” are built in Sweden, often the focus on these questions is oriented around “automation”, and while it is true that automation is used to build wall elements in Sweden, the process is not dependant upon automation.
Here is a paper that lays out much many of the details: Summary of Swedish Wall Element Construction
A new WarmFörm installation in South Dakota for a large ranch style home. Owner and concrete subcontractor laid out and installed themselves for a smooth and painless insulated slab on grade. Feedback – the concrete guy loved this!
Our first runs of WarmFörm elements featured a smooth parged cement face, but its always been our intention to implement a textured face as used by the best manufacturer’s in Sweden. We are ironing out the kinks in our new brushed cement face finish. The idea is that the vertical striated texture will blend better with the vertical joints between the elements for an overall better appearance.
Last week Phoenix Haus, took delivery of four, 9 meter wall framing tables from Randek. The tables are the BS20 “workhorse” that is found throughout Scandinavia providing an ergonomic solution to support panelized wall panel production in a small shop setting. The tables are not motorized, nor are they equipped with any automation, but they clamp, square and turn the walls hydraulically.
PhoenixHaus is focused on producing homes to the “passivhaus” standard – and is located in the center of Detroit, a city that is famous for a lot of things but most recently for having vast areas to rebuild and at least some of these houses will be built to the highest level of building performance, the “passive” standard.
The “butterfly table”, or Vändbord in Swedish, was invented by Randek in 1963, and was designed to allow the wall to be turned or flipped so that work can be done on both sides. Its an ingenious, typically Swedish bit of design that has been copied many times and is standard in European house factories.
Butterfly tables are not used in the US or Canada because producers here do not “turn” their walls during production.
Phoenix, has a closed panel product that will take advantage of the Randek table’s turning function.