1. Sub-floor preparation
(a) Scrape off any debris or mortar splashes from the sub-floor
(b) Brush the sub floor, leaving a flat clean surface, on which to place the insulation.
2. Installing insulation
(a) Place the insulation in 2 layers. Place the first layer between any service pipes on the sub-floor, ensuring it is laid flat.
(b) Fill any voids around the pipes with dried sand and level off, then place the 2nd layer of insulation over the 1st layer, ensuring it remains flat, with no rocking.
3. Installing edge strip and plastic membrane
(a) Install the edging strip around all walls, taking care to ensure it is neatly placed into all corners at 90 degrees. Tack the edging strip to the walls using a staple gun as required to hold it in place.
(b) Place 500 gauge plastic over the top of the insulation, ensuring it is pulled tight with no creases. Lap joints a minimum of 100mm and tape joints
(c) Tape the 500 gauge membrane to the plastic skirt of the edging strip.
4. Installing underfloor heating pipes
(a) Install the underfloor heating pipes, ensuring they are fixed down every 400mm along the length of the pipes and more frequently on bends.
(b) Fill the under floor heating pipes with water.
5. Expansion joints and final check
(a) Install expansion joints across doorways and where the aspect ratio is greater than 1:6. Cut away notches on the underside of the joint to allow it to sit level over the UFH pipes.
(b) Create V notches on the top of the joint, this allows the screed to flow through the joint keeping the same level either side.
(c) Complete a final depth check to ensure there is at least 25mm cover over all pipes, paying particular attention to the corners of rooms
(d) Brush or vacuum out all debris from the surface of the plastic. Any material left will float once the screed is poured and this will result in blemishes on the surface once the screed has hardened. Inspect the whole tanking system for any tears or untapped joints, make good ready for screed to be poured.
6. Pouring of the screed
(a) Only Hanlon Concrete Limited can lay Ultraflo. We will arrive on site, set up the pump, check levels and agree a datum level with you. Once the screed truck arrives with the floorscreed the layers will commence pumping the screed. 6 cubic metres of ultraflo can be pumped in approx 30 minutes. The screed is then dappled in two directions to level the surface and then left to dry.
7. Protection following installation
(a) Immediately after application and until the screed has hardened, keep windows and doors closed for 24hours to protect the surface from frost, direct sunlight, draughts and water ingress
(b) Refer to our Ultraflo Aftercare guide for information on drying, priming and floor coverings etc.