Liquid Screed For Underfloor Heating

Liquid screeds are also known as Anhydrite, Gyvlon, Trueflow and Flowing screeds

Anhydrite is its formal name and belongs to Calcium sulphate family,  this forms the binder in the screed. Many people ask “what is Anhydrite” – Anhydrite screed binder is produced using Synthetic Anhydrite which is a by-product of industry. By using this by-product Anhydrite screed production does not require the high levels of quarrying often associated with cement. And when combined with other polymers and sands forms the basis of a liquid screed.

Flowing screeds have many benefits over traditional methods. When installed over underfloor heating systems we can increase warm up times, reduce the depth required which means more insulation can be installed to increase the U-Value. Liquid screeds are four times stronger than sand and cement, do not shrink and curl and less risk of cracking.

Liquid screeds are manufactured at a plant and delivered to site via mixer trucks where the product is transferred to a screed pump for placement into your property, this is normally a quick operation and saves a lot of labour carrying material’s over the heating pipes.

At WarmFloors we supply Gyvlon (Gyvlon is a trade name for Anhydrite screeds)  for the bulk of the UK, delivery to site does depend on your location and its best to ask if you live in a remote area. Distance from the pump to the property can be up to 100m which often helps.

Liquid screeds can be commissioned as early as 7 days after placement, and we strongly recommend you to get the underfloor heating connected and commissioned as soon as possible, this will force dry the screed and remove any excess moisture in the floor prior to bonding your new floor covering.

Customers often ask should we plaster the walls before screeding? We feel the sooner the slab is installed the sooner it can be drying, so as soon as the property is weather tight we would recommend installing the underfloor heating and screed. Once the slab is installed then the stair case can be measured and gives the trades a decent working surface until completion.

“What about laitence?” “my mate says the screed needs sanding” This is true – Laitence is a thin-film that forms like a skin on the surface of the screed, WarmFloors will always where possible install low laitence screed (skin free) If your bonding floor coverings to the surface then we would recommend the screed to be sanded, but this should be taken on a case by case job and the floor fitter will be able to advise.

We do offer screed sanding as a service please contact us for a quote