Pargro Rockwool Slab | 36in x 6in x 3in with (3) 10x10 Precut Holes - Bag

Pre-Configured Rockwool Slab for a Three-Block Row

Setting up a row of three blocks on a solid slab means measuring and cutting holes to the same spacing every time, a repetitive step a factory-precut slab skips entirely. Grodan's Pargro Rockwool Slab at 36in x 6in x 3in ships with three factory-cut 10in x 10in holes already spaced along its length, ready for three blocks to be set directly into place.

This slab ships individually bagged, twelve to a carton, sized for growers running a standard three-block row rather than a custom layout.

Key Features & Benefits

• Three Factory-Cut 10x10 Holes — pre-spaced along the 36in slab, ready for three blocks without on-site cutting.
• 36in x 6in x 3in Slab — sized to run beneath a standard three-block row.
• Dry-Shipped, Value-Tier Rockwool — ships dry to cut down transport weight, then absorbs water fully once soaked.
• Individually Bagged, 12 per Carton — each precut slab ships in its own bag, boxed twelve to a carton.

Who Should Use This Precut Pargro Slab

Growers running a standard three-block row who want the hole spacing already cut, rather than measuring and cutting a solid slab themselves, are the fit for this precut Pargro Slab.

About Pargro Rockwool

Pargro's precut slab option saves growers the step of cutting their own hole pattern, offered at Grodan's value-tier, dry-shipped price point alongside the company's solid and premium slab options.

Frequently Asked Questions

How are the three holes spaced on this slab?

The slab ships with three 10in x 10in holes pre-cut and evenly spaced along its 36in length, sized for a standard three-block row. That spacing saves growers from measuring and cutting a solid slab themselves.

Do I still need to soak this slab before use?

Yes, it ships dry like the rest of the Pargro line, so soak it in pH-adjusted water until evenly saturated before setting blocks into the precut holes. Skipping that step can leave the slab unevenly wet when blocks are placed.

What size block fits into the precut holes?

The holes measure 10in x 10in, sized for a block of that footprint, so check your block's base dimensions against that opening before ordering. Blocks smaller than the hole may not seat as tightly.

How many of these slabs come in a carton?

Each slab ships individually bagged, with 12 bagged slabs per carton, the same packaging count as Pargro's solid slab option. That count applies whether you order one carton or several.