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Library of Typical Details for a Timber / Steel Frame ACD

Select the required drawings from each section below and the click download.

More Information for Scottish Accredited Construction Details

Scottish ACDs

The construction details in this library are Accredited Scottish details and are the foundation of the Timber / Steel Frame specifications; the construction details determine the fabric specification the U value of the Floor, Wall and Roof, the thermal conductivity and probable air permeability. The emphasis when designing a specification should be to get the fabric of the dwelling right as this is the most cost effective means of making a dwelling energy efficient, this is achieved by the design team downloading the construction details from the Timber / Steel Frame library and using these details to design the building.

  • Insulation: The Timber / Steel Frame construction details in this library are generic, the type of insulation, the width of insulation, the y factor that can be used are determined by the performance level of the dwelling required. This is where the Timber / Steel Frame design information calculator helps the design team determine these variables by offering U value calculators and different design options for 2010, 2013 and building regulations. The design team then adapts the generic detail to suit the performance they require.

  • Thermal bridge: The thermal bridge of a dwelling is determined by the psi values of the Timber / Steel Frame construction details, the Scottish details have specific psi values for each detail. The Timber / Steel Frame calculator will help the assessor collate the relevant dimensions needed to calculate the thermal bridge and it uses the Scottish ACD’s psi values to calculate an individual y factor for a dwelling. When individually calculating the thermal bridge using the Timber / Steel Frame method of construction the y factor can vary between 0.05 - 0.08 W/m2K depending on the design of the building.

    Foresite have introduced new construction head, jamb and sill details, when these details are used in conjunction with the Scottish ACD’s the individually calculated y factor varies between 0.02-0.06 W/m2K which greatly improves the performance of the building. The psi values for the Foresite details have been calculated by recognised software to a BR497 standard so that they can be used to calculate the DER.

  • Air permeability: The air permeability is the only variable in the Timber / Steel Frame model design package and can range between 2 & 8 m3/m2/hr. 50 Pa if the best practice section of this system is followed correctly, the level of air tightness is also determined by the design of the building. The air tight barrier for the Timber / Steel Frame method of construction is formed by a render coat on the internal main walls/airtight membrane or breathable spray foam, and the construction detail and especially around the windows and doors is made air tight be using air tight membrane and tapes or spray foam detail.

When using the Timber / Steel Frame method of construction the designer needs to download these generic details and with the help of an assessor and the Timber / Steel Frame design information calculator determine what materials to use and their width, with the details adjusted to suit the level of performance they require the designer can then design the dwelling using these details.

1.0 Ground Floor

Drawing Junction Description View Download
F/1.1aExposed perimeter insulation below slab
F/1.1bExposed perimeter insulation above slab
F/1.1cExposed perimeter suspended floor slab
F/1.2aParty Wall Junction insulation below slab
F/1.2bParty Wall Junction insulation above slab
F/1.2cParty Wall Junction suspended floor slab

2.0 Intermediate Floor

Drawing Junction Description View Download
F/2.1aExposed intermediate timber floor
F/2.1bExposed intermediate concrete floor
F/2.2aParty wall intermediate timber floor
F/2.2bParty wall intermediate concrete floor

3.0 Roof eaves

Drawing Junction Description View Download
F/3.1Exposed eave for bungalow,2 storey
F/3.2Expoesd eave dormer
F/3.3Exposed eave 1.5 storey
F/3.4aExposed eave to actual dormers
F/3.4bExposed valleys

4.0 Gable Detail at ceiling

Drawing Junction Description View Download
F/4.1Exposed gable ceiling detail
F/4.2Party wall gable ceiling detail

5.0 Rafter Detail and ceiling

Drawing Junction Description View Download
F/5.1Exposed rafter detail at gable
F/5.2Party wall rafter detail at gable
F/5.3aFlat roof detail with facia
F/5.3bFlat roof detail with parapet

6.0 Cornors & Junctions

Drawing Junction Description View Download
F/6.1Exposed external wall coner
F/6.2Exposed internal wall corner
F/6.3Party Wall corner

7.0 Openings Windows & doors to walls

Drawing Junction Description View Download
F/7.1 Lintel at window & door head
F/7.1aForesite lintel at window & door
F/7.2 Jamb at window and door
F/7.2aForesite jamb at window & door
F/7.3 cill at window
F/7.3aForesite cill at window
F/7.4aThreshold insulation below slab
F/7.4bThreshold insulation above slab
F/7.4cSuspended timber floor

8.0 Openings Rooflights & Hatches

Drawing Junction Description View Download
F/8.1aHead rooflight
F/8.1bJamb rooflight
F/8.1cCill rooflight
F/8.2 Roof hatch rooflight


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