Drainage Materials for below grade enclosures include: Coarse sands varying from No. Gap-grading the sand provides uniform grain size, which accelerates drainage flow rates. Prefabricated Synthetic Drainage Layers—These products consist of a combination of plastic composite drainage cores with adhered geotextile fabrics. The plastic composite "dimpled" drainage cores are available in various configurations and are typically constructed using polypropylene, polystyrene and polyethylene.
Plumbing The only problem with lead roof boots is that squirrels love to chew them up. Lead, although poisonous, tastes sweet and that may be the attraction. Below that are two ways that the lead boots can be protected. The homemade wire-mesh enclosure is easy, but a manufactured sleeve that slips over the boot looks better.
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