![]() It also contributes greatly to a high energy rating.Īcceptable or Accredited Construction Details (ACDs) are the go-to when it comes to checking if the work on site is done correctly. Considering the minimum elemental U-value required for walls in both NI and ROI is now 0.18 W/sqmK, this build-up is building regulations compliant. This is based on a 12.5mm skimmed plasterboard finish internally and a 7mm acrylic render externally. This build up achieves a U-value of approximately 0.14W/sqmK. The height of the blocks is typically around 400mm. Common wall thickness we have used in one-off dwellings over the past 12 months consisted of: There are in fact several ICF suppliers on the market who supply different certified EPS blocks. ![]() I have had some queries from ROI Building Control about the description of the ICF materials used to build the house. In those documents, you can file that you are building a solid concrete house. Remember that you as the owner will be the person filing the documents with building control: the building notice in NI (you need to file one for the drawings and another before you start), or the commencement notice in ROI. The EPS is the shuttering that you leave on to provide insulation. What’s important to remember is that you now have a solid concrete wall, not an EPS wall. You now have a solid concrete wall with an inner and outer shutter of EPS. And when you are at the required height, you pour your concrete into the mould. Instead of mortar, you have a sealant you apply with a silicone gun. It can be built like a traditional block wall, one on top of the other. The shuttering is made of expanded polystyrene (EPS) which is lightweight and interlocks together. With Insulating Concrete Formwork (ICF) there is no timber formwork. ![]() Now imagine you didn’t have to strike (remove) the shutter but instead, it’s part of your wall. A very labour intensive and costly exercise. When the concrete is set you can remove the temporary timber shutters, leaving you with a cast in situ concrete wall. The shuttering is tied and propped the required distance apart to form your mould which is then filled with concrete. If you want to build an in-situ concrete wall, you will need to cast it in shuttering or formwork made of plywood or other board material. You can also mould lime or hemp lime mixes in this way. ICF forms are great to engineer with, simply because the forms design allows for a much more consistent and ideal design placement on site, of all reinforcing.In construction, formwork refers to a temporary shutter/mould into which concrete is poured and formed. As for the perpendicular movement, because the horizontal bars are secured in the clips in an alternating pattern, the vertical bars can be "woven" into the horizontal bar to effectively create a basket weave pattern. So if the wall system is speced for 16" centered bar placement, the design is calculated for 24" centered bar placement, which is the absolute worst case. As for the vertical bars, they are restricted to a maximum lateral movement of 8", due to the structural ties which are formed with the block at 6-8 inches on center. The horizontal bar is already held in a fixed location, usually through the integral plasit locator clips on the form system. Although I cannot speak for all, many of the engineered ICF wallsystems we have done, are designed as a worst case for bar placement. Most of the ICF forms do not require rebar tying.
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