Keeping Water Out of Decks

Careful detailing of trouble spots ensures longevity

Predictably, our climate causes a lot of water-related problems, making good flashing details paramount to the longevity of decks and the houses they are attached to.

 

Moisture Management

  • Field-Treating Pressure-Treated Pine

    Even though it's not required by code, it's a good idea to treat all cuts and penetrations in PT pine with copper naphthenate-if you can find it

     
  • Making Porch Floorboards Last

    During many years as a restoration contractor, I bet I’ve replaced over a mile of rotten porch floorboards. Today’s fast-growth lumber has very little natural resistance to rot, so it’s vital that you completely seal the boards before they’re installed.

     
  • Landscaping designs and decking without gaps can drastically affect the drying potential of the framing beneath the deck.

    Decay Resistance and the Code

    Using decay-resistant lumber, field-treating cut ends with preservative, and providing adequate airflow are all ways to help prevent wood decks from rotting. But when are they required by code, and when are they a good idea even if not required?

     
  • Everflashing Ledger Flashing

    Preformed flashing is designed to protect the ledger connection with the house

     
  • Cofair Products Deck Flash Barrier

    This self-adhering peel-and-stick membrane protects joist tops from moisture damage

     

Finishes

 

All Decking & Railing Articles


  • Field-Treating Pressure-Treated Pine

    Even though it's not required by code, it's a good idea to treat all cuts and penetrations in PT pine with copper naphthenate-if you can find it

     
  • AZEK Adds a New Decking Color

    AZEK Building Products has added a light-colored plank to its cellular PVC Deck Arbor collection. The company says the variegated "Hazelwood" decking was developed in response to current trends in hardscapes and exteriors. It's also good at camouflaging dirt, AZEK says.

     
  • Edge Detail for Capped Composite Decking

    A less expensive alternative to installing a picture-frame border to conceal cut decking ends

     
  • Mountain Laurel Railings

    Custom-made mountain laurel railings add an artistic twist to a deck design

     
  • Building Waterproof Roof Decks

    Get better performance from your deck covering by using ‘best practices’ framing and flashing details

     
  • Feeney Lighting for DesignRail

    New LED railing lights fit into recesses in the top and bottom rails

     
  • Fypon Woodgrain Structural Columns

    Steel-reinforced polyurethane holds up better than wood to insects and moisture

     
  • Thompson's WaterSeal Waterproofing Stain

    A flexible film accommodates natural wood movement

     
  • A stair landing should be framed like a small deck capable of supporting 40-psf live loads and 10-psf dead loads. Some inspectors may also require the landing to support 300-pound concentrated loads, like a stair tread.

    Mid-Stair Landings

    Should a landing be treated as part of the stairs or as a separate deck?

     
  • How Long Should Treated Lumber Last?

    Some deck builders have noticed premature rot in treated decking and framing. Are new preservatives and lower retention levels (compared with old 0.40 CCA-treated lumber) to blame, or is the problem the use of above-ground-rated lumber when ground-contact-rated material is required?

     
 
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