Macraes Project

Description of project

IRS Scotland Ltd were appointed as Principal Contracts under the CDM Construction Design Management Regulations 2015 to deliver the Macraes Project on behalf of Aberdeenshire Council.

This project involved the refurbishment of 105 two-storey properties. The properties were system built Macrae type properties, timber framed with the external facade made up of glass reinforced concrete panels screwed on to a wooden frame substrate. The refurbishment involved careful removal and appropriate disposal of the glass reinforced concrete panels. The screw fixings attaching the glass reinforced concrete panels to the wooden frame had become corroded over time causing the panels to fail. After exposing the timber frame of the building, IRS installed an A1 fire-resistant cement particle board screwed back to the existing frame, IRS then installed an aluminium railed Phenolic board external wall insulation system to the entire façade of the building finished with a silicon rendered finish.

During the asbestos surveys it was highlighted that the properties like many of this era had issue with Asbestos which was found within the loft areas. In order to combat this IRS appointed Enviraz specialist asbestos contractors to temporarily encapsulate the problem area. This allowed IRS to continue their work and strip the roofs of their existing tiles and rafters. These were then replaced with new sarking boards screwed to the rafters, new weather resistant, air-permeable membrane, new tile and counter battens, new Marley concrete roof tiles, roof eves extensions and gable ladder extensions to accommodate the new external wall thickness, new UPVC facia, soffit, gutters and downpipes, new front and rear doors. 25 properties also received new window installations, renewed front and rear threshold steps, external handrails, temporary relocation of satellite dishes, television aerials and BT cables maintained continuous service during the relocation period.

Additionally, during the summer months there was a large nesting of Swallows and House-Martins in the area. This meant that IRS management had to coordinate and reschedule many properties out of sequence. The management team worked closely with Aberdeenshire Council and RSPB representatives to accommodate the nesting birds with no detrimental effect to the contract delivery time frame but also to ensure the safety of the birds

Key Features

condensation risk analysis U-value calculation
Building warrant applications and local permissions Pull out testing with engineered calculations
Fully enclosed Scaffolding Soil, ventilation pipe and gas flue extensions
Fabric substrate repairs Fungicidal treatments
Fascia and soffit renewal New window & door installations
Fire compartmentalisation Relocation of temporary services
Scrim & level coat Installation of stress pads
Corner beads Extension of all gas flues incorporating daily gas safety and flue management checks
Silicon top coating Ventilation management
New aluminium over sills Complete sarking removal and re-instatement
breathable membrane Tile and counter battens
New roof tiles

New eaves and ridge system  

External fabric painting Full customer handover packs
Full Eco compliance and DOCC Energy performance certificate


Client: Aberdeenshire Council
Value: £3.75 million
Start Date: 1st June 2019
Completion: 17th November 2019
Duration: 6 months

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