Sound Absorbing Roof Lowers Noise Levels

By ROCKWOOL. 

This office building by the airport experiences less noise and a quieter work environment by using stone wool insulation in their latest roof remodel. 

Contracting company Flynn Canada has 17 offices all over Canada and recently turned a warehouse into another office space. But with the new office being right by the airport, the company found that there were a lot of noise problems present. They decided to reroof the building and met with Valcoustics, an acoustical engineering consulting firm to help them reduce their issues with noise transmission. Valcoustics ended up using ROCKWOOL products to insulate the roof. 

ROCKWOOL product installed 

ROCKWOOL Toprock® DD is a rigid stone wool insulation board with exclusive dual density properties. It features a higher density top layer providing strong point load resistance and effective load distribution. Toprock is fire resistant, water repellent, sound absorbent, sustainable and has a long-term stable R-value. 

Roof assembly 

• White single ply TPO membrane adhered with asphalt 

• 5/8” cover board mechanically attached to the deck 

• 2.5” Toprock DD insulation 

• 1.5” polyso insulation 

• Vapor Barrier 

• Steel deck  

“Based on the same sound level at the roof for the pre and post renovation condition, the indoor NC level has been reduced from NC 61 to NC 39 with the indoor sound level dropping from 58 dBA to 45 dBA. This reduction is a direct result of the roof upgrade, which included the addition of the ROCKWOOL Toprock DD 2.5 inch insulation,” said Valcoustics. 

Why Toprock DD was chosen 

ROCKWOOL Toprock DD 2.5” was used over existing materials to retrofit the roof for noise reduction. ROCKWOOL insulation products demonstrate superior sound reduction characteristics and improved low frequency sound absorption to both normal and random incidents of noise. The unique non-directional structure is denser than traditional insulations. This effectively reduces airflow and sound transmissions for excellent sound reduction. 

Results 

Substantial improvement in the indoor acoustical environment was achieved. Outdoor sound levels due to the aircraft flyovers were reduced by up to 39 dB. Meetings are no longer interrupted by airport traffic noise due to 13 dB noise reduction after re-roof. 

Architect: 

Geza Tormasi- Associate with 

Glenn Piotrowski Architect Ltd. 

167 Navy St., Oakville, Ontario L6J 2Z6 

t. 905.338.8855 

Location: 

Toronto, Ontario 

Project timeline: 

2010-2011 

Project size: 

82,000 sq feet 

Learn more about ROCKWOOL in their RoofersCoffeeShop® Directory or visit rockwool.com. 

Original article source: ROCKWOOL