Only use quality-assured screed mixes
One of the biggest factors that can affect the performance of screed is the mix itself. It’s important to use quality-assured screed to eliminate the risk of a sub-par product. At Rapid Readymix, all our screed is BSI-certified, which guarantees quality with every pour so that you can be sure you’re using the best mix.
Heating and cooling causes expansion
As with most building materials, screed expands and contracts in line with the temperature. As such, it’s important to make sure expansion joints and perimeter foam are used to give the screed a bit of breathing room. Screed and underfloor heating systems should only be constructed if the temperature is above 5°C.
Screed needs time to dry
Another common issue with screed and underfloor heating systems is that, if the screed isn’t given enough time to dry, it can be easily damaged. Standard screed needs about 30 days to dry, while liquid screed takes about seven days – although you need to calculate a more accurate time based on the mix and depth of the screed. The rough calculation is one day per mm of screed for the first 50mm, and two days per mm after that. Until the screed is completely dry, it must not be walked on or have flooring installed on top of it.
You can check whether the screed is dry by assessing the moisture levels – either by using a hygrometer or by laying plastic sheeting and checking regularly for condensation.
How do I choose which type and depth of screed I need?
When it comes to choosing your screed, you first need to know how much pipework you’ll be using for the underfloor heating system. Then you need to choose the thickness of your screed. While thicker screeds cause the heating system to take longer to warm up (about an hour), they also retain the heat for longer. If you need help choosing the type of screed you need, the Rapid Readymix team can help – just get in touch.
Order screed with Rapid Readymix concrete services in London and Surrey
Here at Rapid Readymix, we provide fast, efficient and quality-assured screed delivery for underfloor heating projects across London and Surrey. With our BSI certification, you’re guaranteed quality every time.
For a free, no-obligation quote for your screed delivery, call Rapid Readymix on 0208 335 9900 today.