Bridge Wood Block
Frames are the gateway block to building. They can be used to rough out base ideas or as temporary scaffolding.
Pick them up at any time. Upgrade them with wood & a construction tool to make them permanent and much stronger.
Repair with wood & a construction tool.
Upgrade path
Bridge Wood Block→ 10× Cobblestone Rocks →
Cobblestone Block→ 10× Concrete Mix →
Concrete Block→ 10× Forged Steel →
Steel BlockHit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 4 hits per upgrade.
Harvest drops
Wood× 2
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Wood Debris (Terrain) (75% of the time) where it lands.
Where to find (7 POIs)
Don Vittorio Spagetto Residence (tier 4), Haulwell Freight (tier 3), Pal's Marina (tier 2), The McElveen Residence (tier 2), BJ's Gas Dock (tier 1), The Hinton Residence (tier 1), The Powell Residence (tier 1).
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.