At Roundtower Lime, we supply high-performance airtight and windtight systems designed to improve the energy efficiency, durability, and comfort of both traditional and modern buildings. Our range includes the globally renowned Pro Clima collection of membranes, sealing tapes, adhesives, and accessories — engineered to ensure airtightness, vapour control, and wind protection while maintaining breathability for moisture-safe construction.
Why Airtightness & Windtightness Matter
Achieving airtightness prevents uncontrolled air leakage, reducing heat loss, draughts, and the risk of interstitial condensation. Windtightness protects insulation from wind-washing, ensuring thermal performance is not compromised. Together, they are essential for meeting Passive House, NZEB, and Part L building standards.
Our Airtight & Windtight Product Range Includes:
Pro Clima INTELLO Plus & DB+ Membranes
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High-performance internal airtight vapour control layers
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Intelligent membranes with variable permeability (INTELLO)
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Ideal for both deep retrofit and new build
Pro Clima SOLITEX FRONTA & SOLITEX PLUS Membranes
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External windtight breather membranes
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Hydrophobic, highly vapour open, and robust under Irish weather conditions
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Excellent UV stability and waterproofing
Pro Clima Tapes & Sealants
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TESCON VANA – multipurpose airtight tape for membrane overlaps and junctions
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TESCON INVIS – black version for visual integration
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CONTEGA SOLIDO – airtight plaster-to-membrane sealing tape
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ORCON F – durable, elastic airtight adhesive
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Suitable for sealing timber, masonry, membranes, boards, and junctions
Application Areas
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Timber frame and masonry buildings
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Attics, roofs, and ceilings
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Internal drylining systems
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Renovation projects requiring improved airtightness
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Passive house and EnerPHit upgrades
Benefits of Using Pro Clima Systems from Roundtower Lime:
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Improved thermal performance and lower energy bills
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Reduced condensation risk and better building health
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Robust vapour diffusion control in heritage and modern buildings
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Approved and tested systems for compliance with airtightness targets
Frequently Asked Questions (FAQ)
Q: Are Pro Clima membranes breathable?
Yes. The Pro Clima external membranes (e.g. SOLITEX) are highly vapour open, allowing moisture to escape while protecting against wind and rain. INTELLO is vapour-variable, allowing drying to both sides.
Q: Can these systems be used in traditional or historic buildings?
Yes. With proper detailing, Pro Clima membranes and tapes are ideal for improving airtightness in retrofit and conservation settings, especially when paired with breathable insulations like woodfibre or hemp.
Q: Do these membranes work with lime-based materials?
They can be integrated with lime plasters and breathable construction methods using compatible tapes such as CONTEGA SOLIDO and adhesives like ORCON F, especially at junctions with masonry or timber.
Q: Will I still need ventilation if my building is airtight?
Yes. Airtightness must always be paired with controlled ventilation, such as mechanical heat recovery systems (MVHR) or decentralised HRUs, to maintain healthy indoor air quality.
Q: What’s the difference between airtight and windtight membranes?
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Airtight membranes are installed on the warm side (interior) of insulation and stop air leakage and vapour diffusion.
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Windtight membranes are applied externally to prevent wind penetration and protect insulation, while still allowing vapour to escape.
