Pargro Rockwool Slab | 36in x 6in x 3in - Bag

Solid Value-Tier Rockwool Slab for Custom Block Spacing

Some commercial rows need blocks spaced to a custom pattern that a factory-precut slab can't match, calling for a solid slab a grower can configure to their own layout. Grodan's Pargro Rockwool Slab at 36in x 6in x 3in ships without any precut holes, giving growers a blank, dry-shipped, value-tier stonewool surface to set blocks on at whatever spacing their row requires.

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

Key Features & Benefits

• 36in x 6in x 3in Solid Slab — no factory holes, left open for a grower's own block spacing.
• Dry-Shipped, Value-Tier Rockwool — ships dry to reduce transport weight, then re-wets fully once soaked before blocks go on top.
• Consistent Structure — uniform density supports even water distribution along the slab's length.
• Bag Packaging, 12 per Carton — individually bagged slabs, twelve to a carton.

Who Should Use This Solid Pargro Slab

Growers who want to set blocks at a custom spacing rather than a factory-precut pattern, and who want a value-priced dry-shipped slab, are the fit for this solid Pargro Slab.

About Pargro Rockwool

Pargro Rockwool Slab gives growers a consistent, easy-to-handle structure for uniform water distribution, offered dry-shipped at Grodan's value-tier price point rather than the company's premium pre-soaked slab options.

Frequently Asked Questions

Why choose a slab with no precut holes?

A solid slab lets a grower set blocks at whatever spacing their row or irrigation layout calls for, rather than being locked into a factory hole pattern. It's a common choice for growers running a non-standard block size or spacing.

How do I prepare this slab before placing blocks on it?

Soak the slab in pH-adjusted water until it's evenly saturated, since it ships dry rather than pre-moistened. Once wet, position blocks on top at the spacing your row needs and connect irrigation to each block.

How many slabs come in one carton?

Each slab ships individually bagged, with 12 bagged slabs per carton. That packaging keeps slabs protected and easy to count for inventory.

What's the difference between this slab and the version with precut holes?

Both measure 36in x 6in x 3in and use the same dry-shipped, value-tier rockwool. This version ships solid with no holes, while Grodan also offers the same slab with three factory-cut 10x10 holes for a fixed three-block spacing.