WBS External Wall Insulation Systems - Refurbishment Applications

Home > External Wall Insulation - Refurbishment

EXTERNAL WALL INSULATION
FOR REFURBISHMENT APPLICATIONS

Heat loss through external walls

The external appearance of a building is truly an important aspect, especially to its residents, yet increasingly, with the rapid depletion of the world’s energy resources, high profile environmental issues such as climate change, are beginning to take precedence over aesthetic preferences and stringent legislation demands that the thermal performance of any building is strictly governed.

External Wall Insulation is the perfect solution to this problem.

Improve energy efficiency

External wall insulation was introduced to Britain in the 1960’s, yet it would be fair to say that it has taken time to establish itself. However, over the last ten years, the Decent Homes Standards and Part ‘L’ of the Building Regulations have significantly increased insulation standards and the demand for more innovative solutions for renovating properties, increasing thermal performance and reducing carbon emissions.

The system involves the mechanical and/or adhesive fixing of insulation boards to the outside of a building, which is then covered with a mesh reinforcement, a base coat and a final decorative finish. This layered method encases the property and helps prevent heat from escaping unnecessarily from the property.

All of the WBS systems allow architects to confidently specify a range of flexible building solutions that not only conform to current building regulations and energy standards, but offers a wide choice of final finishes to fully meet the clients aesthetic expectations.

WBS External Wall Insulation Systems

	Are a cost effective alternative to demolition & rebuild
	Reduce unnecessary heat loss & CO² emissions
	Reduce condensation
	Protect and prolong the external fabric of a building
	Offer high impact resistance
	Offer superb weather resistance
	Low maintenance
	Does not reduce footprint of a property
	30 year life expectancy
	Have a positive effect on the environment

Further information on WBS EXTERNAL WALL INSULATION - REFURBISHMENT can be found by accessing the individual sections from the menu on the left.

Heat loss via external wall

Phenolic & EPS onto Airey Houses

Unity Houses before Refurbishment

Unity Houses after Refurbishment

TYPICAL SYSTEM BUILD UP

Typical EWI System Build Up

1. The base of the system is reinforced using a full depth polyester coated galvanised steel or stainless steel bellcast bead and finished with a plastic nosing available in a limited range of colours. Line of base is usually set at DPC level.

2. 1.2mm polyester coated aluminium verge accessory with jointing collars at 2.5m centres. Range of sizes exist to suit varying insulation slab thickness.

3. Undercill or overcill extenders can be supplied in 1.2 - 3.0mm thick polyester coated aluminium with matching push fit end caps for site fabrication. Cill extenders may also be site measured by WBS technical personnel and factory fabricated with one piece welded end caps. Cill details are also available in moulded GRP or extruded GRC sections.

4. At party wall positions, the EWI system may be terminated using a full depth stop bead or an external angle bead. The render finish is returned for the full depth of the system. N.B. Where the adjoining property is also being treated, allow for fitting WBS expansion joint/movement joint bead.

5. 1200mm x 600mm x thickness insulation slabs are fixed using approved fixings.
N.B. Fixing types are selected subject to site pull out testing.

6. Insulation slabs overlap alternately at corners and are mechanically fixed 150mm in from arris and every 300mm vertically.

7. Where possible, a reduced thickness of insulation slab may be returned at opening reveals and heads dependent on window or door frame thickness. External angles are reinforced with polyester coated galvanised steel or stainless steel angle beads. Where frames are too small, mesh and render alone may be used. A contrasting colour may be used at reveals.

8. Extra mechanical fixings are used around all wall openings at 300mm centres max.

9. Alkali resistant reinforcing mesh bedded into adhesive render coat and allowed to dry for a minimum of 12 hours, but not exceeding 24 hours, before render finishing coat is applied.

10. Additional shaped pieces of mesh are bedded around all wall openings.

11. All external building corners are reinforced with polyester coated galvanised steel or stainless steel angle beads to give maximum impact resistance.

12. WBS dashing mortar is through coloured and can be trowel applied and dashed with a wide range of mineral aggregates, or alternatively finished with a alternative finish (such as silicone, acrylic, brick rend or brick slip).

13. The chimney may be treated to match the finish on the main walls.

14. Plinth below DPC level of the existing wall may be painted with WBS masonry paint.