Page 127 - GRIHA Manual Volume V - Introduction to National Rating System
P. 127
120 Griha Manual: Volume 5
2. drawings and narratives which describe the various measures taken to comply with the
indoor noise levels specified by the nbC 2005.
3. manufacturer brochures/product specification sheets should be submitted specifying the
sound reduction properties of the materials used.
4. boq demonstrating the purchase of the relevant materials.
Review Checklist
1. Check that the sound audit is done over a certain period of time and the sound levels are
measured in multiple rooms (at least all the rooms at the periphery of the building and
close to outdoor noise sources).
2. Check that the sound levels are also measured after the construction equipment has been
removed from site.
3. Check the sound reduction properties of the materials used for indoor noise reduction.
4. Check that the noise reduction strategies adopted are relevant.
Possible Errors
1. indoor noise levels might not be measured at regular intervals during the proposed
working/ occupancy hours.
2. noise levels might not be measured in all the peripheral rooms.
3. the brochures for materials used might not have the relevant properties mentioned for
sound reduction. both nrC and Sri might not be mentioned.
4. there might be a mismatch between the boq and the manufacturer brochures.
Point Allocation
1 point to be awarded if the indoor noise levels comply with the nbC 2005 recommended levels.
2. drawings and narratives which describe the various measures taken to comply with the
indoor noise levels specified by the nbC 2005.
3. manufacturer brochures/product specification sheets should be submitted specifying the
sound reduction properties of the materials used.
4. boq demonstrating the purchase of the relevant materials.
Review Checklist
1. Check that the sound audit is done over a certain period of time and the sound levels are
measured in multiple rooms (at least all the rooms at the periphery of the building and
close to outdoor noise sources).
2. Check that the sound levels are also measured after the construction equipment has been
removed from site.
3. Check the sound reduction properties of the materials used for indoor noise reduction.
4. Check that the noise reduction strategies adopted are relevant.
Possible Errors
1. indoor noise levels might not be measured at regular intervals during the proposed
working/ occupancy hours.
2. noise levels might not be measured in all the peripheral rooms.
3. the brochures for materials used might not have the relevant properties mentioned for
sound reduction. both nrC and Sri might not be mentioned.
4. there might be a mismatch between the boq and the manufacturer brochures.
Point Allocation
1 point to be awarded if the indoor noise levels comply with the nbC 2005 recommended levels.
