Edward

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  1. EPS 300 is a Jablite product. Cellcore and Heaveguard is a Cordek product, Cordek also manufacturer EPS, called Filcor. Enter your postcode here and you can discuss this with Cordek directly https://cordek.com/contact/ and they can assist you with your insulation calculations. Its unlikely you will need EPS 300 - its probably overspecced on the vertical, so this could save you some cost. On your second drawing, the slab does not appear to be tied in to the foundations. This wont work with the presence of heaving ground.
  2. Hi all Were about to install the Rehau UFH system in our old house, which has a suspended floor, with unequally spaced joists. The sizing of the joists rules our aluminium spreader plates and because we want to keep the FFL the same, we have decided on foil lined polystyrene panels in between the joists. Our builders are currently insulating the floor with Rockwool prior to the joists being installed. I have two questions: 1) There appears to be a few different type of foil lined EPS joists boards on the market, would you recommend one over another and if so why? 2) I am slightly concerned about the conduction from the foil backed board up into the floorboards - there is a chance of a small cold bridge here, would it be worth packing the interface between the EPS and the floorboard out with a conducting material to ensure there are no air gaps? 3) Finally is the type of tile on the floor important as we are most likely to use a porcelain tile. Many thanks
  3. Yes, access to under the floor wont be compromised once the UFH has been laid. Nick, thank you. I understand the basic differences between closed and open cell foam. Can you elaborate on what should be used where? Obviously avoiding the timbers sweating is important! Thanks Ed
  4. Thanks Scottishjohn. I think on second thoughts it would be easier if i get a contractor to quote for the spray foam as you suggested.
  5. Ok thanks for the reply. I dont have any plans yet. Yes the floor is in, the house was built in the 30s. Its my kitchen floor, and the depth of the space underneath the floor is enough to stand up in. The u value of 0.25, as far as im aware, is the U value which new builds are required to achieve. What u value should i be aiming for do you think? I do not wish to raise the floor for a multitude or reasons which arent relevant at the moment, so the spreader plate is the only option at the moment. The whole purpose of insulating the floor is to stop the downwards loss of heat, and im trying to address that to the best of my knowledge. If what ive suggested wont work, what would be the best solution?
  6. Hi everyone. New to the forum as i'm looking for some advice please. I am looking to insulate between the joists of my suspended timber floor (ground level) to an acceptable standard in order for my plumber to install UFH. We will be most likely using the REHAU spreader plate system so not to raise the FFL. Ive a few questions about the process: 1) Do i need to be concerned about moisture/condensation - should i install a DPC type membrane and if so, should this go above or below the insulation? 2) Does it matter if the spreader plates are touching the insulation, or do i not need to be too concerned about the space between the top if the insulation and the bottom of the plates? 3) Should i ensure any gaps between the insulation and the joists, external walls of the house are as air tight as possible? Should i use a tape or expanding foam? 4) Finally, im torn between using a rockwool type insulation or a kingspan board which will need cutting to size. Any opinions of which to use and why is appreciated. Our builder has quoted £5k for this aspect of the renovation (i asked him to achieve a u value of 0.25w/m2 or less), and as far as im aware its relatively straight forward. Any advice is greatly appreciated, thanks in advance Edward