At Roundtower Lime, we supply a carefully curated range of waterproofing and breathable sealing solutions tailored to the needs of traditional buildings, conservation projects, and modern renovations. Our range includes Delta Membrane Systems for robust cavity drainage waterproofing as well as breathable hydrophobic agents that protect porous surfaces while maintaining their vital ability to breathe.
We understand that moisture management in solid wall construction requires a delicate balance between water exclusion and vapour permeability. Our systems are selected to prevent water ingress, rising damp, and condensation issues without trapping moisture within the fabric of the building.
Our Waterproofing & Breathable Sealant Range Includes:
Delta Membrane Systems (Type C Drained Protection)
Delta is a BBA-certified, professional-grade waterproofing system trusted across the UK and Ireland. It features studded High-Density Polyethylene (HDPE) membranes such as Delta MS500, Delta MS20, and Delta PT, designed for:
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Internal basement waterproofing (walls, floors, and vaulted ceilings)
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Flood resilience and damp remediation
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Heritage and retrofit applications with minimal impact to the building fabric
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Type C systems in accordance with BS 8102:2009
Complementary Delta accessories include:
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Delta Fixing Plugs, Qwikseal, PT Plugs, and FlexiDri Plugs
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Delta Tapes, Rope, and Corner Strip for secure and watertight membrane sealing
Breathable Hydrophobic Sealants
Our breathable water repellents are invisible surface treatments formulated to reduce water absorption while allowing full vapour permeability — ideal for stone, brick, lime render, and mortar.
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Stops rainwater ingress
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Minimises freeze/thaw damage
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Does not form a plastic film
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Suitable for conservation use
These breathable water repellents are perfect for protecting vulnerable facades without compromising moisture movement or trapping salts.
Why Choose Roundtower Waterproofing Solutions?
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Breathable systems designed for traditional and solid masonry walls
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BBA-certified waterproofing membranes for below-ground and flood-prone areas
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Non-invasive treatments for sensitive heritage surfaces
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Full technical support for membrane design and installation
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Tried and tested on stone cottages, basements, churches, and lime-built walls across Ireland
Frequently Asked Questions (FAQ)
Q: Can waterproofing membranes be used in heritage buildings?
A: Yes. Delta Membranes are classified as a reversible system and are widely approved for use in historic or listed buildings. They do not damage substrates and can be removed without harm.
Q: What’s the difference between a breathable sealant and a conventional sealer?
A: Breathable sealants repel liquid water but allow water vapour to pass, maintaining the breathability essential in older walls. Conventional sealers block vapour and can trap moisture, leading to decay or spalling.
Q: Can I paint over a breathable hydrophobic treatment?
A: Most breathable sealants are clear and non-film-forming. Some limewash or silicate paints may be compatible, but it’s always best to check with us before overcoating.
Q: How long do breathable hydrophobic agents last?
A: High-quality formulations can last 10+ years, depending on exposure. Reapplication may be required in highly exposed areas.
Q: Can I use Delta systems on floors?
A: Yes, Delta MS500 and MS20 are suitable for floor applications in basements or damp-prone areas.
