Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 5/25/2017

Can stones be placed on a wood deck under a grill?

Is it safe to lay concrete 12 inch stones on top of a pressure treated deck?

Do you have the same question? Follow this Question

1 Answer


Assuming you mean concrete pavers (an inch or two thick) the weight should be no problem over a small area, - like just under the grill. Especially on a fully supported deck. I would be awful cautious about this if the deck is a cantilevered balcony without support posts underneath.

However - using pavers leaves gaps between them (unless you grout them) which rainwater and grease and burning material could go through, so if you intend this as a fireproof surface not the greatest idea. Also, because of the gaps as well as seepage along the deck boards in from the sides, water will accumulate under there and keep the deck wet perennially - eventually promoting rot even on treated wood - especially if this was not ground contact rated timber.

If this is for a charcoal barbecue - not a good idea to put that on a wood deck ever - every year in our area there are 2-5 apartment buildings / condos / duplexes and a home or two that go up in flames from people using charcoal/pellet barbecues on their decks.

For propane grill - to catch sporadic burning grease and help keep grease stains off deck, I recommend fiberglass-reinforced concrete backer board - the 100% concrete type, not the water-resistant drywall type). Available in 3x5 and 4x8 sheets in our area. Highly grease absorbent unless you paint with concrete floor and deck paint- latex garage floor paint works well.

There are also commercial fire-resistant mats to go under grills, like these -

However, none of the above eliminates the wetness underneath - to minimize that and promote deck board drying I support it on about four 1/4" square strips of cedar or 1/4" square metal strips to provide an airspace underneath, though the strips themselves will leave permanent stripes on the deck wood. Anything placed over the deck under a grill will do that though, just like furniture sitting the same spot on a carpet for many years causes unfaded spots, unless you change the location around every 3-6 months.

Answered 3 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy