Damp Proof Course a.b.e.® Construction Chemicals‘ range of Waterproofing Products for Parapet Walls consists of: DIY - malthoid2, 3 and 5-ply malthoid. malthoid is an asphaltic waterproofing membrane with a fibre felt carrier. Easy-to-apply, economical and rot proof. Additional Information Conversion Tables Formulae Trigonometry Tables Heath & Safety