Main Loft

Current State

• Open loft void above bedrooms
• No fire separation currently
• Sound travels between rooms via loft (over block walls)

Sound Issues

• Block walls between bedrooms are great for sound
• BUT: open loft void above allows sound to travel over walls
• Plasterboard ceilings flex and transmit vibration
• Joist voids (if running over walls) act as sound bridges

Planned Solutions

PIR Wall Extension

• Extend block wall height using PIR in loft
• Blocks air path (main sound transfer route)
• Even 1 foot of PIR above wall line helps significantly
• Not soundproofing per se, but air barrier does most of work

Acoustic Blanket

• Rockwool or similar over ceiling joists
• Additional mass reduces sound transfer

Needs

• PIR wall extensions above bedroom walls
• Fire separation (consider as part of garage conversion regs)
• Ventilation (ensure not blocked by insulation)

Notes

• 22mm cold water main loops up here and back down (legacy tank system)
• Rafters sit over wall, accessible from outside
• Roof valley area - wrap in PIR (25mm on hand)