A car park gets a new durable makeover

Car parks always provide a welcome relief, making life much easier when they are located close to supermarkets and other shopping facilities, or near hospitals and schools. They also allow you to access an entire city infrastructure by car, which, depending on the situation, might simply be more convenient or be really necessary. Upper Hundreds multi-storey car park is located in Aylesbury Town Centre with spaces for 305 vehicles.

The car park, which is owned by Aylesbury District Council, was suffering from a failed waterproofing system on its top deck, allowing water ingress into the lower decks of the car park. This water ingress had caused spalling to the concrete screed, to the ramps and pedestrian walkways.

After further testing it was found that the concrete substrate did not have sufficient cohesive strength to support the application of a new car park deck system without further case hardening.

Remove, repair, and apply again

The project required removing existing failed coatings and concrete screed and repairing damaged concrete on the deck, ramps and soffits. A case-hardening resin had to be applied to increase the cohesive strength of the concrete.

Concrete repairs were carried out using Sika® Rapid Repair Mortar, a cementitious mortar with high early strength. The high early strength property ensured that the time the deck was out of service was kept to a minimum. To increase the cohesive strength of the concrete decks, application of a case-hardening resin was required. Sikafloor® low viscosity epoxy case-hardening resin was chosen to strengthen the concrete prior to the application of further car park deck systems.

Prevent future water penetration

To ensure the future integrity of the car park, a waterproof car park deck system with fast setting properties were required to prevent future water penetration and the resulting damage. Makers, the main contractors on the project, applied Sikafloor®-32 Pronto, a fast-curing, crack-bridging, mechanically and chemically resistant, elastomeric deck system. This system was chosen to give a slip-resistant, hard wearing waterproof surface.

Protect against reflective cracking

Sika® Reemat Premium was incorporated into the Sikafloor®-32 Pronto system to protect areas of movement such as construction joints, existing cracking and up-stands. This system with the inclusion of Sika® Reemat Premium has been fully tested to meet the highest crack-bridging standards available on the market. These include BS EN 1062-7 Method B, which tests the complete system through 20,000 crack cycles up to 0.5mm @ -20 oc.

The test demonstrates the ability of the system to protect against reflective cracking penetrating through the membrane and ensures the future integrity of the deck. The fast-setting properties of Sikafloor®-32 Pronto decking system, even at low temperatures, allow work to proceed quickly, minimizing disruption to the client.

Sika Car Park Decking systems are specially designed to meet the harsh conditions that car parks are subject to, and provide durability, cost effectiveness and an excellent finish. So the citizens of Aylesbury can look forward to enjoying its advantages safely and for a long time.