Possible Clues:

• Ma produces new device to keep house dry
• Solution to wet home - as cured with mop possibly?
• Protective wall layer
• Check series of lectures touching feature of building
• Feeble piece of training for building insulation
• Mistakenly mass-produce only one single protective component of building
• Stop money holder claiming money, not in housing benefit?
• Obstruct firm in contract for waterproofing
• Heavy going for the race at the bottom of the building
• Not part of 17 across to keep the water down