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Masonry Joint Sealants

Control joints move, and the sealant has to move with them. Sikaflex 11FC, Construction AP, and Seal N Flex polyurethanes carry plus and minus 25 percent movement on expansion and control joints. Fireban One cures low-modulus for high-movement panels. Backing rod sets correct bead depth; see our accessories range for...

Frequently Asked Questions

When should a masonry movement joint be sealed?
Seal the joint after surface preparation and waterproof detailing are done, when the joint shape and bond faces are ready. Choose a sealant by movement, substrate, exposure, joint design, and any fire or acoustic requirement. Fire-rated materials need the right installation system and certification.
Which products work on concrete and brickwork joints?
Bostik Seal N Flex, Sika Sikaflex PRO, Sikaflex Construction AP+, and Sikaflex 11 FC+ cover concrete, brickwork, masonry, precast, and cladding. Cartridge and sausage packs are available. Check pack format, primer, backing, and joint size first.
Is fire-rated sealing in this range?
Yes. Fireban One covers fire-rated joints in insitu concrete, precast panels, blockwork, plasterboard, and fibre cement sheet. The rating applies to the product and installed system, not the sealant alone. Check the technical documentation for your joint design and installation system first.
Why are different sealant types in the same group?
Joint sealing is one job. Sealant chemistry and pack format are separate choices. Cartridges, sausages, fire-rated material, and gap-filling foam all appear here where they fit masonry or concrete work. Choose by joint design, movement, substrate, exposure, tool, certification, and finish.
What does expanding foam do here?
MapePUR Universal Foam M/G fills structural gaps and frame interfaces before the finished seal. It is not the final joint sealant, and it is not a substitute for the sealants in this group. Check cavity size, moisture, trimming, and finishing seal before use.
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