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Perimeter strip
Regardless of the type of screed being used, an expansion edge strip should always be installed around all walls, stairs, columns and pipe penetrations that the screed will come into contact with.
It is required to allow for expansion and movement as the screed dries, cures, or heats up (especially with underfloor heating). The strip should sit flush against the walls and be fitted behind the polythene membrane.
Perimeter Strip is designed to provide a compressible strip at the perimeter of a floating or unbonded screed, allowing for thermal and natural movement within the floor build-up. It is ideal for use with all underfloor heated screeds, helping to reduce stress and minimise the risk of cracking.
The affixed polythene “skirt” provides a simple way to seal the perimeter by lapping and taping it to the polythene (or other membrane) beneath the screed. Perforations in the strip allow easy tearing to the correct height after the screed is installed, leaving a clean finish ready for skirting and final floor coverings.
Vertical control joints
Heated screeds should always include movement joints across doorways and between areas with separate underfloor heating control zones.
Correct joint placement is essential to manage thermal expansion and reduce the risk of cracking. Always follow guidance from your underfloor heating manufacturer when planning joint locations.
Expansion joints can be formed using pre-formed 10mm closed cell polyethylene foam with a self-adhesive T-bar base, commonly known as a vertical control joint. These create a defined movement break within the screed, allowing controlled expansion between heated sections.
Vertical control joints should be installed during the UFH installation stage, before screeding begins.
Screedflo can supply these at the time of your pre-installation site visit, available in 1800mm strips if required.
500 gauge polythene membrane (125 Micron)
Our 500 gauge polythene membrane (125mu) is suitable for use beneath floating and unbonded screed systems, helping to form a protective layer within the floor build-up.
Supplied as a folded 1m x 4m black polythene membrane,
The roll size is:
1m by 4m x 25m
Covers 100m²
This membrane is designed for use within standard screed installations and can be lapped and taped to create a continuous layer beneath the screed.
Gaffer tape
Our general purpose gaffer tape is ideal for sealing membrane overlaps, securing perimeter strip skirts, and ensuring a neat, professional screed installation.
Specification:
50m length
75mm wide
Strong, durable adhesive for construction use.
Screedflo can supply gaffer tape at the time of your pre-installation site visit if required.