Concrete Repairs & Deck Membrane Remediation

Hemel Hempstead, Hertfordshire, March 2026

Multi-Storey Car Parks

Project overview

Concrete Repair Solutions were appointed to undertake concrete make-safe works and deck membrane remediation to the car park structure at Technology House, Hemel Hempstead.

Following inspection and assessment, the scope included removal of loose and potentially hazardous concrete, localised deck membrane patch repairs, substrate repairs following membrane removal, gulley detailing works, and replacement of deteriorated expansion joint mastic.

The works formed part of a planned intervention to reinstate safety, watertightness and long-term durability to the car park deck system.

What we did

Concrete Make-Safe
(Car Park)

Removed loose and potentially hazardous concrete cover
Cleaned exposed reinforcement via mechanical preparation
Applied corrosion inhibiting primer to exposed steel

Deck Membrane
Patch Repairs

Carefully removed failed or delaminated membrane to clean edge
Cleaned and prepared exposed substrate
Applied primer/bonding agent where required
Installed new compatible deck membrane, lapped into existing system
Ensured continuity and watertight finish

Substrate Repairs (following membrane removal)

Inspected deck substrate for cracks, delamination and spalling
Removed defective material to sound substrate
Treated exposed reinforcement where encountered
Reinstated deck levels using proprietary repair mortar/resin

Gulley &
Joint Works

Redressed membrane detailing at deck gullies
Ensured watertight integration with drainage components
Removed and replaced deteriorated mastic sealant to expansion joints
Installed new backing rod and applied new sealant

Technical overview

Technology House comprises a commercial office building with associated car park deck infrastructure incorporating waterproof membrane systems, drainage gullies and movement joints.

Inspection identified areas of concrete deterioration and membrane failure, resulting in localised water ingress risk and potential safety concerns.

Loose and delaminated concrete was removed to eliminate hazard and expose sound substrate. Reinforcement encountered during breakout was mechanically cleaned and treated with corrosion inhibiting primer.

Failed sections of deck membrane were removed and replaced with compatible membrane systems, ensuring proper lap detailing and continuity with surrounding sound material. Where membrane removal exposed substrate defects, localised structural repairs were undertaken prior to reinstatement.

Gulley interfaces were redressed to ensure correct integration between drainage components and membrane system. Existing mastic to expansion joints was removed and replaced, restoring movement capability and weather-tightness to the deck.

Project challenges

Working within a live commercial car park environment
Sequencing multiple repair elements within limited working zones
Maintaining drainage integrity during gulley remediation
Ensuring compatibility between existing and new membrane systems

The outcome

The completed works reinstated safety to affected concrete areas and restored watertight integrity to the deck membrane system.

Membrane repairs, substrate reinstatement and joint replacement provide enhanced durability and reduce the risk of ongoing water ingress and structural deterioration.

The car park deck now benefits from improved performance, continuity and long-term resilience.

Services demonstrated

Concrete make-safe and structural repair
Reinforcement preparation and corrosion protection
Deck membrane patch repairs
Substrate repair following membrane removal
Gulley detailing and waterproofing integration
Expansion joint sealant replacement
Commercial car park remediation

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