Hep2O® - Within Timber Framed and Steel Framed Buildings

Hep2O® Within Timber Framed and Steel Framed Buildings

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Hep2O® is ideal for use within both timber framed and steel framed buildings. For recommendations applicable to internal partition walls refer to the text headed Hep2O® within Internal Drywall Systems. Running pipework of any material within the external wall of framed buildings should not be done without consideration of the following:-

	If a leak occurred on a pipe it should be discovered without delay as seepage within a wall may damage the structural frame and affect the performance of insulating materials.
	Water Byelaws require that pipes should not be fixed in a situation where leaks could be undetected for long periods.
	Where a pipe passes through a vapour control layer the installation method should allow possible future replacement of pipe without affecting the integrity of this layer.
	Pipework should be installed on 'warm' side of thermal insulation layer.

To comply with the foregoing criteria, pipework should be either run within a recessed duct designed by the Architect or run within a conduit system. Whichever method is used it is necessary to consider the detail at the junction between the wall and floor to avoid floor joist problems and to agree pipe penetrations at header rails/bottom rails. For radiator connections, 10mm Hep2O® within conduit pipe may be used (see Figure No. 47) The suggested installation sequence is as follows:

1.	Prepare sketches showing setting-out dimensions for each dry lining box including height and hole size.
2.	Fix each conduit pipe to noggins using suitable straps or cable ties. Fixings at 1m centres are adequate for vertical conduit pipe. Horizontal runs and bends more than 45° should be avoided.
3.	To allow future installation of dry lining boxes, each conduit pipe end should be left approximately 100mm longer than box position and should not be fixed closer than 600mm to the box.
4.	Install the main 'first-fix' pipework leaving joints below floor access covers to allow connection to conduit pipework during 'second fix' work.
5.	Using setting-out dimensions on sketches, holes in plasterboard can be cut to allow each conduit pipe to be pulled out through the surface during plasterboard fixing work.
6.	During 'second fix' each dry lining box is installed by drilling a 26mm diameter hole for 15mm (nominal) conduit pipe. The conduit can then be inserted through hole in box and should 'click' into position leaving one or two conduit 'ribs' inside box.
7.	Slide a length of 10mm Hep2O® pipe through conduit pipe from the floor access above. Pull out enough Hep2O® from dry lining box to allow a sufficient hand grip for jointing. Connect a demountable elbow to pipe then slide whole assembly through plasterboard hole and secure box into position. Conduit pipe should ÔsnakeÕ within void to take up slack leaving Hep2O® protruding out of box.
8.	Pull Hep2O® pipe backwards from floor access panel until elbow is central within dry lining box. Cut pipe to length and connect to Hep2O joint left during 'first-fix'.

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