Case study Forfar

The Problem
A chalet bungalow in Finavon, Forfar was suffering from ireated foundation movement. The 1m deep strip footing was suffering downward movement due to the consolidation of alluvial river bed deposits which ran directly under two sections of the property.The damage was confined to the rear of the garage and the rear right-hand corner of the main property.

Optera were requested to pile and stabilise the two areas as well as rebuilding the blockwork above, and realigning the roof of the garage.

The Solution
We designed a scheme of compression and tension piles which were bottom driven, steel cased piles achieving a set at around 6m below ground level. A RC needle would then be cast under the footing to provide permanent support to the affected parts of the building. Originally, it was intended that we would rebuild the back wall of the garage which was duly completed but during repairs to the kitchen, it was established that the rear wall of the bungalow had slipped substantially off the wall plate. Consequently, we revised the repairs, taking down the rear corner and rebuilding the rear left-hand corner of the bungalow to line and level. The piles were all installed as planned.

The garage roof was partly stripped of tile to reduce the weight and the garage ceiling plasterboard removed to expose the timber structure within. A spreader board was placed across the ceiling joists and a series of accro props and hydraulic jacks were used to lift the roof structure back into alignment. Once completed, the wall plate was replaced and fixed into the new blockwork which provided permanent support to the realigned roof structure.

Project Conclusion
Once all the rebuilding works were completed, the roughcast render was applied to the areas of rebuild and the internal reinstatement and decoration works were completed. The customer, a civil engineer himself, commented on the excellent standard or workmanship throughout the repairs. The entire project was completed on time and within budget.

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