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Basement waterproofing of existing vaulted damp cellar under Listed building in Monmouth
by Protectahome
An existing vaulted damp cellar under a Listed building in the historic town of Monmouth had a known history of ground water flooding and had rudimentary drainage channels already built into the original flagstone floors. The property owner wanted to utilise this damp cellar for habitable accommodation, as a music room, media room or home office.

A quality basement waterproofing system was designed and installed to meet the specific site requirements and comply with the developer's programme of work. A drained cavity drain membrane method of waterproofing was selected, giving particular consideration to the impact on the structure and the reversibility of the process.

A waterproofing system was designed and installed that included under floor perimeter drainage channels connected to multiple sump chambers. In each sump chamber there were two automatic submersible pumps with high water alarms and battery backups. An 8mm cavity drain membrane was applied to walls and floors. Cavity drain membrane with a mesh welded to the surface was fully fixed over the vaulted ceilings ready to accept the direct application of render coats. The ingenious design included the use of combined wall finishes enabling services to be hidden behind metal framed stud walls. These walls were constructed at low level, between the floor and the springing points of the vaults.

A high standard of finish was achieved within a relatively short programme of work. The client remained in occupation of the building throughout the work, which was completed on time and within budget. A number of difficult problems on site were overcome and this previously damp cellar was transformed into a useable space for the owner who was delighted with the end result. The installation also benefitted from the provision of a long term guarantee. 

This case study has been submitted by a member and the British Structural Waterproofing Association accepts no responsibility for its content.

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