Sector Housing, private
Project type Refurbishment
Services provided Product / system manufacture
Product / system supply
Client 5 Star Basements
 
 

Context

This project, which was featured on TV in Grand Designs on 6th January 2021, involved the restoration and transformation of an abandoned Neo-Gothic cemetery-keeper’s lodge with adjoining public facility into a luxurious mansion. Works included demolishing the adjoining public facility to enable the construction of a new basement level.

Delta registered installer, 5 Star Basements, undertook the dig-out and installation of the structural waterproofing.

Internal waterproofing

Delta boots were first installed to the ends of all structural steel beams (where they were within the earth retaining walls) ensuring protection from any potential water ingress.

Prior to the installation of a Type C cavity drainage system, all newly poured concrete was treated with an application of Koster Polysil TG 500, an anti-lime inhibitor. Koster NB 1 Grey fillets were created to critical wall and wall/floor junctions to seal against pressurised water (>13 bar). Koster KB Flex 200 was used to detail and seal around all cable and service pipe penetrations.

A drained cavity system (a Type C waterproofing system) collects and manages any moisture/water ingress which breaches the integrity of the structure by channelling, collecting and discharging such free water via a suitable evacuation point.

A combination of a maintainable modular/sub slab drainage system was incorporated into the ground bearing basement slab with the basement floor levelled to no more than 1-10mm.

A bespoke submersible sump pump unit was incorporated to manage the drainage aspect, with Delta Dual V4 pumps included to discharge any water entering behind the Type C waterproofing. A bespoke sump pump unit was also incorporated (with specialist Dual 2502 pumps inside) to remove any foul/grey waste water from the facilities within the basement and to act/serve as a back wash water pump for the pool.

Lightwells can be problematic if they're not drained correctly, and to ensure no small amounts of water percolated through the construction and put undue stress on the basement integrity, an additional bespoke chamber (800mm diameter x 1300mm deep) with dual V4 pumps within was incorporated to negate any ingress which may arise.

By adding AlertMaxx2 high level water alarms and Hi-PowerMaxx battery backups to the bespoke pump system, not only are the pumps monitored 24/7 by a virtual engineer, in the event of a power outage, the sump pump system will continue operation ensuring all water ingress is suitably managed and discharged.

The Type C system was completed by installation of Delta MS 20, MS 500 and PT membranes prior to fit out.

External waterproofing

External drainage systems protect underlying waterproofing systems from backfill damage and minimise water ingress to the internal waterproofing system.

Koster Repair Mortar plus was firstly used for creating fillets around upstands and skylights.

For an intermediate waterproofing solution for underneath screeds and for bonding insulation and drainage boards an application of Koster Deuxan 2C was applied to offer a permanent exterior waterproofing layer.

This was further enhanced by Delta Terraxx being laid as a surface layer. This dimpled sheet, geotextile layer was used to protect the patio terrace and enabled the moat feature.


Context

This project, which was featured on TV in Grand Designs on 6th January 2021, involved the restoration and transformation of an abandoned Neo-Gothic cemetery-keeper’s lodge with adjoining public facility into a luxurious mansion. Works included demolishing the adjoining public facility to enable the construction of a new basement level.

Delta registered installer, 5 Star Basements, undertook the dig-out and installation of the structural waterproofing.

Internal waterproofing

Delta boots were first installed to the ends of all structural steel beams (where they were within the earth retaining walls) ensuring protection from any potential water ingress.

Prior to the installation of a Type C cavity drainage system, all newly poured concrete was treated with an application of Koster Polysil TG 500, an anti-lime inhibitor. Koster NB 1 Grey fillets were created to critical wall and wall/floor junctions to seal against pressurised water (>13 bar). Koster KB Flex 200 was used to detail and seal around all cable and service pipe penetrations.

A drained cavity system (a Type C waterproofing system) collects and manages any moisture/water ingress which breaches the integrity of the structure by channelling, collecting and discharging such free water via a suitable evacuation point.

A combination of a maintainable modular/sub slab drainage system was incorporated into the ground bearing basement slab with the basement floor levelled to no more than 1-10mm.

A bespoke submersible sump pump unit was incorporated to manage the drainage aspect, with Delta Dual V4 pumps included to discharge any water entering behind the Type C waterproofing. A bespoke sump pump unit was also incorporated (with specialist Dual 2502 pumps inside) to remove any foul/grey waste water from the facilities within the basement and to act/serve as a back wash water pump for the pool.

Lightwells can be problematic if they're not drained correctly, and to ensure no small amounts of water percolated through the construction and put undue stress on the basement integrity, an additional bespoke chamber (800mm diameter x 1300mm deep) with dual V4 pumps within was incorporated to negate any ingress which may arise.

By adding AlertMaxx2 high level water alarms and Hi-PowerMaxx battery backups to the bespoke pump system, not only are the pumps monitored 24/7 by a virtual engineer, in the event of a power outage, the sump pump system will continue operation ensuring all water ingress is suitably managed and discharged.

The Type C system was completed by installation of Delta MS 20, MS 500 and PT membranes prior to fit out.

External waterproofing

External drainage systems protect underlying waterproofing systems from backfill damage and minimise water ingress to the internal waterproofing system.

Koster Repair Mortar plus was firstly used for creating fillets around upstands and skylights.

For an intermediate waterproofing solution for underneath screeds and for bonding insulation and drainage boards an application of Koster Deuxan 2C was applied to offer a permanent exterior waterproofing layer.

This was further enhanced by Delta Terraxx being laid as a surface layer. This dimpled sheet, geotextile layer was used to protect the patio terrace and enabled the moat feature.


 
 
 
Downloads
  • Case study: Lodge basement waterproofing
    Case study: Lodge basement waterproofing
    6pp 2.41MB
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Delta Membrane Systems Ltd
DELTA House
Merlin Way
North Weald
Epping
CM16 6HR
Tel: 01992 523523
Fax: 01992 523250
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