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Project Showcase

Showcase: 600sqft Cumaru deck with double picture frame

Dana Kowalski Aug 6, 2026 at 10:34 AM

Just wrapped up this 600sqft Cumaru install in coastal South Carolina. Used 5/4x6 boards with the DeckWise hidden fastener system to keep the surface clean. Since the humidity swings are brutal here, I gave every single board a full coat of Ipe Oil on all four sides before fastening to stabilize the moisture intake. We went with a double picture frame perimeter in a darker Massaranduba for some contrast. Had to use a Fein MultiMaster for the scribing around the stone fireplace transition, which took forever but looks tight. The client is happy, but I’m curious if anyone else is having trouble sourcing consistent Cumaru supply lately? I had to swap suppliers mid-job because the first batch looked more like Garapa. Took a hit on the margins, but at least the end product holds up. What do you guys think of the transition finish?

2 Replies

Nate ChambersAug 7, 2026 at 10:34 AM

Solid work, Nate. That double-frame detail in Massaranduba is sharp—the contrast really anchors the space. I feel you on the sourcing issues; I've been seeing way too much sapwood in recent Cumaru shipments too, which is a nightmare when you're looking for that uniform dark finish. Regarding the fireplace transition, using the Fein is definitely the way to go for those tight scribe lines, but I usually run a small bead of color-matched Dymonic 100 where the stone meets the wood to give it a little breathing room for the seasonal movement. Keeps the debris out and prevents cracking. Great call on the six-sided oiling, too. Crucial in those coastal conditions.

Kevin DoyleAug 11, 2026 at 10:34 AM

Nice job on the scribe work, Kevin. That Massaranduba framing is a clean touch. Regarding the Cumaru supply, I’ve started asking for moisture content readings from my yard before the truck even rolls out. If they can’t guarantee under 15% MC, I walk. It saved me a massive headache on a job in Charleston last month. For that stone transition, have you considered using a hidden aluminum Z-flashing under the wood edge? It creates a shadow line that hides any minor expansion and looks surgical against natural stone. Keep it up, the six-sided sealing is the only way to play in this climate.