What do you put under a second story deck to keep it from dripping onto a patio below
Andrew Vasquez
Updated on April 16, 2026
A vinyl under deck system provides an affordable option. The panels are snapped into place under the second story decking. The materials allows rainwater to collect and drain in an area away from the lower story.
What can I put under my deck to stop water?
The best way to waterproof under your deck is with a deck drainage system installed during construction. A drainage system diverts water away from the joists and beams. An over-the-joist deck drainage system such as Trex RainEscape provides 100% protection from the damage caused by wood repeatedly getting wet.
What to put under a high deck?
A layer of crushed gravel, with or without plastic or weed barrier cloth, is the best choice for using under a deck. It sheds moisture instead of absorbing it, keeps the area under the deck drier, and won’t decay.
How do you keep underneath a deck dry?
- One option is to cover the deck boards with a watertight membrane. …
- If you’re building a new deck or replacing your deck boards, you can use a system like Trex RainEscape, which installs in the joist spaces before you install the decking.
What do you put under deck drainage?
Compacted gravel around wood posts allows for adequate drainage and keeps water away from the wood which helps to prevent rot and extend the life of the deck. When used beneath a concrete footing gravel prevents water from pooling up underground which reduces issues related to erosion that can compromise your deck.
How do I cover the bottom of my deck?
- Lattice.
- Fence boards.
- Vinyl siding.
- Composite fascia boards.
- Stone faux.
What should I put under my second story deck?
A vinyl under deck system provides an affordable option. The panels are snapped into place under the second story decking. The materials allows rainwater to collect and drain in an area away from the lower story. It also provides the added benefit of covering the view of the underside of your decking.
Should you put plastic under a deck?
Plastic under the deck will trap moisture, increase rot and attract insects to your deck. Landscape fabric is a better alternative for stopping weeds from growing under the deck while allowing water to drain. … Never put plastic under a deck except if its part of a dry deck system drainage system.How do you waterproof a wood deck?
Apply a thin, even coat of high-quality, mold- and mildew-resistant, waterproof sealant with UV protection, such as Woodsman® Water Repellent or Woodsman® Wood-Toned UV Wood Sealer and Protector, using a stain brush, in the direction of the boards.
Should I put a vapor barrier under my deck?Do not install a vapor barrier beneath the deck. … Water vapor from the soil can cause severe cupping of the decking. The underside of the decking boards readily absorb moisture that evaporates from the soil.
Article first time published onWhat is the best sealant for wood decks?
- Thompsons Waterseal Advanced Natural Wood Protector.
- ECO-SAFE Wood Treatment – Stain & Preservation by Tall Earth.
- Rust-Oleum Coppercoat Wood Preservative.
- CabotStain Australian Timber Oil Penetrating Oil.
- Thompsons Waterseal – Transparent Stain.
Is Trex waterproof?
No composite decking is waterproof. … “[Trex decking can be install] in intermittent contact with water, i.e., splashing and not in continuous direct contact with water, the durability of the Trex decking should not be affected.”
Can you caulk between deck boards?
While you might be tempted to fill in gaps in your decking with wood filler or caulk, the natural movement of the boards can eventually cause the materials to break loose and make the gaps even worse. However, you can use rope to easily fill the gaps.
Can you build a room under a deck?
With a little thought and a little extra effort and material, this under-utilized area can add to the appearance, comfort, and value of your home. Not only is this a project for capturing additional outdoor living space, but defining the area under your deck will also add character.
What is the longest lasting deck sealer?
Q: What is the longest-lasting deck sealer? An oil-based deck sealer, such as Rust-Oleum Ultimate Spar Urethane, will protect a deck for up to 5 years.
Is it better to seal or stain a deck?
Sealing a deck is best for cedar, teak, mahogany, or other quality woods as it enhances the wood grain and natural color. … Staining a deck protects the wood from mold, mildew, moisture, and rot, and UV rays and sun damage.
How do you waterproof seal a deck?
- Check the weather to be sure you’ll have temperatures between 50 and 90°F. This temperature range ensures the best seal.
- Clean off the deck surface — both furnishings and debris. …
- Sand, if needed. …
- Stir the sealer. …
- Apply the sealer with a paintbrush, paint roller, or sprayer. …
- Repeat and fine-tune.
- Let it dry.
What is the membrane under decking?
As used by professional landscapers the Weed Control Fabric Membrane ensures no unwanted vegetation or weeds can surface. Used under the decking substructure the Weed Control Fabric keeps your deck area clear of weeds over the years.
Can you put decking on top of gravel?
If you’re laying your deck straight onto the ground, cover the area with a layer of weed control fabric. Then add 40 mm to 50 mm of gravel on top. The other method is to create concrete pads for the deck to sit on top of. … This will show you if you have enough decking to complete the job.
Is Thompson Water Seal good for decks?
Thompson’s WaterSeal Waterproofing Wood Protector is a super-durable clear wood sealer. It prevents water damage while maintaining the natural color of the wood. It’s our top choice for decks, fences, and outdoor furniture that has a natural wood finish.
How long does Thompson Water Seal last?
Water Seal can only be used on bare and uncoated brick, stone or concrete. How long will Water Seal last? If applied correctly, Water Seal will last up to 4 years.
Does polyurethane make wood waterproof?
Polyurethane, varnish, and lacquer are tried-and-true sealants with excellent waterproofing properties. They’re either brushed or sprayed onto clean, sanded wood and then allowed to dry completely, prior to the piece being lightly re-sanded and recoated.
Does composite decking puddle?
Composite decking is designed to resist water and the rot associated with wood decking. You should, however, still do what you can to minimize standing liquid like puddles.
Can you seal a Trex deck?
Trex composite decks are designed to look like natural wood decks, and we offer deck designs in a range of wood colors and stains. You won’t ever need to seal or stain the deck, and you certainly don’t have to (and shouldn’t) paint it.
What is deck drain?
Deck drains are designed to collect water from the patio and divert it to another desired location. … Strip Drains (also referred to as trench drains) are basically long, narrow grates which water trickles into then flows through the underground trough away from the patio.
Does wood filler work on deck boards?
Wood filler and caulk do not work well for decking. There are several reasons for this. The wood filler does not “stain” to match the deck finish. This can be frustrating for someone staining a deck.
Can I use wood filler on a deck?
If your wood deck has small holes, is pitted, or has small areas of rot, you can use wood filler for deck repair. However, larger, or major damage will need more than wood filler.
How do you fill gaps between boards?
You can use putty, wood filler, caulk, or even long pieces of string or rope stained to match. These methods not only fix the gaps but can also prevent drafts from coming up through the floor. If done correctly, these fillers – made of putty or paste – can fill in gaps to give your floors their original smooth finish.