Structural Repairs, Dampproofing and Sealing
Structural Repairs, Dampproofing and Sealing in Cape Town
RENU Painting & Waterproofing provides professional structural repairs, concrete spalling repairs, damp proofing and sealing services for residential, commercial and sectional-title properties throughout Cape Town.
Cracked concrete, rising damp, deteriorating plaster and failed seals can allow moisture to damage a building over time. RENU assesses the affected area, identifies visible signs of deterioration and recommends a suitable structural repair, damp-proofing or sealing solution for the property.
Structural Repairs and Concrete Spalling Repairs
Concrete is a durable building material, but many structural elements rely on steel reinforcement for strength. When moisture reaches the reinforcing steel, corrosion can develop. As the steel expands, the surrounding concrete may crack, loosen or break away, resulting in concrete spalling.
Concrete deterioration may be linked to moisture ingress, carbonation, chlorides, ageing materials or continued exposure to Cape Town’s coastal conditions. Addressing damaged concrete early can help limit further deterioration and reduce the likelihood of more extensive structural repairs.
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Damp Proofing and Rising Damp Repairs
Rising damp occurs when moisture travels upwards through porous walls and masonry by capillary action. This can happen when the original damp-proof course is damaged, incorrectly installed, deteriorated or missing.
Older Cape Town properties may contain ageing bitumen-based damp courses or may not have an effective damp-proof barrier. High groundwater levels, winter rainfall and moisture around exterior walls can make an existing damp problem more noticeable.
Common signs of rising damp include peeling or blistering paint, damaged plaster, powdery salt deposits, staining, damp patches near the bottom of walls and persistent musty odours.
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Sealing of Expansion Joints, Windows and Door Frames
Buildings naturally expand and contract as temperatures and moisture levels change. Flexible sealing around expansion joints, windows, door frames and other openings helps accommodate limited movement while reducing the risk of rainwater entering through gaps and joints.
Cracked, deteriorated or missing sealant can allow moisture to penetrate around frames and exterior openings. RENU assesses the affected areas, removes failed material where necessary and applies a suitable sealing system for the surface, location and level of exposure.
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Structural Repair and Damp Proofing Services
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Structural and concrete spalling repairs
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Rising damp assessments and damp-proofing treatments
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Expansion-joint and exterior crack sealing
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Window and door-frame waterproof sealing
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Choose RENU Painting & Waterproofing for structural repairs, damp proofing and sealing in Cape Town, supported by professional assessment, suitable repair systems and dependable workmanship.
What Our Clients Say
Read feedback from clients who have trusted RENU with painting, renovation, building maintenance and property repair projects.
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★★★★★
“Outstanding workmanship and a truly professional team. Communication was excellent, the project was well planned and the attention to detail exceeded our expectations. We highly recommend RENU.” V. GrobbelaarRead Google review |
★★★★★
“We recently had our house painted by Michael and his team and couldn’t be happier with the result. They were reliable, friendly and hardworking. The job started and finished on time. Highly recommended.” T. CutinoRead Google review |
★★★★★
“We have used RENU twice and both experiences have been excellent. Professional service, quality workmanship and a team that takes pride in their work.” B. van der LindeRead Google review |
Request a Structural Repair or Damp Proofing Quote
Contact RENU to arrange an assessment for concrete damage, rising damp, failed seals or water entry around windows, doors and expansion joints.
Frequently Asked Questions
What is concrete spalling?
Concrete spalling occurs when parts of a concrete surface crack, loosen or break away. It may be associated with moisture reaching reinforcing steel, corrosion, carbonation, chlorides or prolonged weather exposure.
What are the signs of rising damp?
Signs may include peeling or blistering paint, crumbling plaster, salt deposits, staining, damp patches near the bottom of walls and musty odours.
Why does rising damp occur?
Rising damp occurs when moisture travels upwards through porous masonry. This can happen when the damp-proof course is damaged, incorrectly installed, deteriorated or missing.
Can damp proofing help prevent peeling paint?
Damp proofing may help where peeling paint is caused by rising damp or moisture penetration. The moisture source should be identified and repaired before damaged plaster and paint finishes are restored.
Why is sealing important around windows and doors?
Sealing helps reduce rainwater penetration through gaps around frames, joints and exterior openings. Flexible sealants can also accommodate limited movement caused by temperature and seasonal changes.
Does RENU repair expansion joints?
Yes. RENU can assess failed or deteriorated expansion-joint sealant and recommend a suitable repair and resealing method for the affected area.
Does RENU work with body corporates and property managers?
Yes. RENU assists body corporates, homeowner associations, property managers and sectional-title complexes with structural repairs, damp proofing, sealing and planned building maintenance.
How can I request a quotation?
Contact RENU to arrange a property assessment. The team will inspect the affected area, visible damage, moisture concerns and required access before preparing a quotation.