Lead Sheetrock, 1/2? to 3/4? thick; Standard sizes 4’x4?, 4’x7?, 4’x8? and 4’x10?. Other special order sizes available. Seam Filler – 2? wide lead strip by the thickness and length required to prevent leakage in the seams. Screw Shielding – Prevents leakage; in stock. Lead screw shield, 1/16? and 1/32? thicknesses Sheetrock® Drywall Joint Compound - 5 Gallon - Premixed For Easy Application - For Use With Drywall Patches And Tapes To Repair Interior Drywall Cracks And Holes - Mfg #380501 Shop drywall panels in the drywall section of Lowes.com. Find quality drywall panels online or in store. Aug 31, 2005 · I guess it depends on local building codes and where the room is located, but I am wondering what the rule of thumb is? 1/2" blueboard is readily available, while I would need to go to a commercial dealer to get 5/8". Which brings up another question....does 1/2" blueboard/sheetrock plus the 1/8" veneer count as the 5/8?