I live in the North East and want to add a GRADE LEVEL extension to a new 1st floor level exterior Deck. The reason is to use the same composite decking material at grade level in the yard to extend the uniformity of the deck (material) after you descend the 4-5 steps into the yard. Please note this grade level extension MUST be the same height as the rest of the concrete in the yard.
The concerns with laying the foundation for this extension after you step down from the deck is how do I protect he material from the elements. What materials do I use? I recognize drainage is key but any pointers on how to execute the foundation would be appreciated. Maybe a sketch of the cross section would help showing the material information called out – as installed.
I have seen grade level extensions but they are 1 step height above grade and all the beams are above the ground – I am looking to have the decking boards at the same height as the grade. Thanks Raj
Replies
That's bound to rot. I wouldn't do it.
Dig a pit where the deck extension will be, deep enough for the deck framing, footings, gravel, etc to clear with an extra space for ventilation.
Add footings for the deck extension. Top of footings to be 4 to 6 inches above bottom of pit, so that any wood will be well above the bottom gravel lining.
Short retaining walls at the sides, tops even with grade. Install drainage. Line with landscape fabric, then gravel.
Frame deck. Edge of deck boards with 1" gap to the retraining walls.
and access to drain so you don't get clogs that lead to a pool; and as Andy suggests, it is likely a bad idea. Far better to put in a bluestone patio or something like it
Other ways to get a uniform look include more cement or similar pavers on the ground level. less digging involved.
Excellent thoughts for me to rethink this given the labor intensive nature. Will also weigh the cost of alternative material such as bluestone, etc. Thank you all so far. This is enlightening.