Product Installation - Kingspan Thermawall TW50
Kingspan Thermawall® TW50 is normally held in position by the wall ties used to tie the two skins of
Wall ties should include a retaining disc / clip and be of the double drip type, installed drip downward.
For a solid concrete ground floor the first row of wall ties are installed in the inner leaf at 600 mm horizontal centres
a minimum of one course of blockwork below the damp proof course or 150 mm below the top surface of the ground floor perimeter insulation up-stand (see ‘Linear Thermal Bridging at the Wall to Floor Junctions’ above), whichever is the lower.
For a suspended timber floor the first row of wall ties are installed in the inner leaf at 600 mm horizontal centres a
minimum of 200 mm below the top surface of the ground floor perimeter insulation up-stand.
Continue constructing the inner leaf up to the next wall tie course (450 mm above the first – usually 2 block courses).
The next course of wall ties is positioned at the usual 900 mm horizontal centres in the UK and 750 mm horizontal centres in Ireland.
The next course of blockwork is installed to secure the ties.
The first row of insulation boards should now be installed between the two rows of wall ties, ensuring each insulation
board is retained tight against the inner leaf and joints are lightly butted.
Each board should be secured at a minimum of three points. Additional ties may also be required to satisfy the
structural requirements of BS 5628–3: 2001 and / or to ensure adequate retention of boards or cut pieces.
The outer leaf is then built up to the level of the top of the boards and the process is repeated.
When insulating a gable, insulation boards should be continued 250 mm beyond the height of the top storey
ceiling and a cavity tray installed above the insulation.
After raising each section of inner leaf, before installation of the insulation board, excess mortar should be removed
and mortar droppings cleaned from exposed edges of the installed insulation boards.
Use of a cavity batten or cavity board is recommended to protect board edges and maintain a clear cavity (see
Figures 7 & 8 or refer to BBA Certificate 94/2992 or NSAI Agrément Certificate 03/0196).