System Platon

	DRAINAGE CHANNELS (top)


	(PAM Pre-formed peripheral Conduit) if the PAM Aqua channel cannot be formed/inserted into the floor at the wall/floor junction, because there are in-situ reinforcing bars in the slab. Then either a fall must be created in the floor (as previously described under the heading falls) or a series of small surface channels (cut into the floor like chevrons) must be formed with a fall towards the direction of the sump/water collection chamber.

	EXISTING PLASTERS (top)


	Plaster that may be affected by being closed in behind the Platon cavity membrane such as gypsum or lightweight plaster or where the existing plaster is loose or de-bonding should be removed from walls/soffits prior to membrane application. Only where dense and well adhered sand and cement renders are present and where removal may cause unwanted structural damage to substrates can they be left in place.

	SUMP CHAMBERS (top)


	Consideration must be given to the implications of fitting sumps in the ground, e.g. where unstable elements are present, such as chalk or sand. The installation of a perforated sump chamber could cause washing away and potential undermining. Therefore, in such cases, only sealed sumps should be installed and structurally held in place by concrete etc, with the water collection limited to that entering from the drainage channels. The final decision on the sump type in cases where ground conditions are unknown should be delayed until excavation is undertaken. Important note; if there is any concern as to whether there is a risk of de-watering the ground to a condition whereby the structure as a whole could or maybe undermined, then advice should be sought from a chartered engineer.