Google our website for more information - INSULATION SALES Wall Batts range from R1.5 - R2.5 to suit 430 & 580 joist spacings. *** Ceiling Batts range R2.5 - R4.5 to suit 430 & 580 joist spacings. *** Acoustic Batts R1.5 - R2.5 to suit 430 & 580 joist spacings. Pick up from the WEST HEIDELBERG warehouse, or we can arrange delivery. HAVE A LARGE ORDER? Talk to us about a DISCOUNT. WE ARE YOUR ONE STOP SHOP FOR YOUR INSULATION BATTS, BLANKET, AND WALL WRAP NEEDS!.