Screened-in Porch Question
Q: I am building a screened-in "porch" over a pre-existing patio. The patio has a cement floor and I want to install a wood floor over it. Sleepers will raise the new floor about 5 inches above the cement slab, but will not be ventilated. The room will have a roof, but the screens will allow for some weather. I had considered using Mahogany decking, but planned to install without any spacing. I am now afraid this will buckle with changes in humidity and have changed my thinking to a tongue and groove porch decking material. I am not sure of what would be best in this situation. Do you have any recommendations?
A: When exposing wood to uncontrolled climate, such as the great outdoors, it is key to keep in mind you must use product suited for this application. Although this patio will have a ceiling, it is best to treat it as you would a deck. Using a tongue and groove decking material for your patio should work, but keep in mind you will want to leave room for expansion similar to installing any hardwood floor. This should help alleviate worry of buckling issues you might run into. You will also want to acclimate your product so that the wood's moisture content is within 2-3% of the subfloor of your patio. Keep in mind, this can take awhile as the environment you are installing in is not controlled like the interior of your home and if this area has some open air below the decking without having ventilation your could run into issues with moisture accumulation beneath the floor.
Beyond patience in allowing for acclimation and account for some expansion room to ensure the floor does not buckle, treat this similar to a deck by ensuring proper weather sealing is on the floor decking. Do not use residential flooring for a project like this, as it is not suited for the uncontrolled outdoor environments. I hope this helps you out for your project.
Follow-up: After some review by a co-worker of mine, I realized that I forgot to mention a good product to take a look at for this would be slat decking such as the ones iFLOOR.com carries by Vifah. Vifah's snap together plank decking is very easy to install, is well suited for a deck or outdoor porch, and its a great looking product. Now if your specifically after a single plank look rather than the slated look of Vifah's deck planking, you will want to ensure the planks you purchase are made for outdoor use, such as decking and make sure its properly water sealed.





