DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Decks & Patios > Under deck draining system, do I need to seal underneath before installing system?

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Old 02-27-2017, 10:25 AM  
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Default Under deck draining system, do I need to seal underneath before installing system?

I'll be sealing my deck (off the second story) soon, and I'll be installing a draining system afterwards as we have a deck under it and I'd like to sit out there during when it rains

Should I seal underneath too? I only ask because the draining system will cut off air flow from underneath so it won't dry like it would if there was nothing there

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Old 02-27-2017, 12:00 PM  
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Have you picked out a product to provide the drainage? If it is one of the systems offered by deck material makers (like Trex) they might have some advice, or they may specify how to ventilate properly. Even if you are planning on a DIY drainage system, their advice might help you design it properly.

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Old 02-27-2017, 12:27 PM  
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A drainage system should not stop air flow?
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Old 02-27-2017, 01:40 PM  
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I helped my SIL's SO install one last summer. There was plenty of airflow to allow the deck to dry out after a storm.

This was the brand we used. The system is pretty slick. I'd like to do at my own house some day.
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