Construction Technology 3 Flashcards
Unit 7 Bellway: What parts of Approved Document B applied?
Section B4 - External Fire Spread - Section 13.
Due to building being up to 5m in height 60 minutes fire resistance required to 80% of elevation.
Unit 7 Bellway: What parts of Approved Document L applied to the wall?
Approved Document L2A - New buildings other than dwellings. (due to regularisation)
Thermal element minimum u-value requirements:
New build: approx. 0.26 (THIS APPLIED)
Extensions: 0.28
Renovation and repair: 0.30
Unit 7 Bellway: What other systems did you consider and why were they not suitable?
Internal plasterboard/liner (SELECTED)
Extending the masonry blockwork internally to full height.
Internal liner panel and cladding roll, utilised the existing grid system. System not tested with certain cladding sheets therefore couldn’t confirm with certainty that would work.
Unit 7 Bellway: Why did you select the plasterboard double fireline system?
Design specific solution:
- Shaft wall as stated by Gyproc.
- Met the clients aesthetic requirements to use a internal liner panel.
- Met BC’s functional requirements (Doc B and L)
Double layer fireline board complies with BS 476: Part 22 as a fire rated wall one metre or more from a relevant boundary.
Unit 7 Bellway: What options did you discuss with the client at the outset?
Composite system - quick, desired performance in a single panel, expensive.
Built up systems:
- Plasterboard system. Various types and thickness could have been used. Utilised the Gyproc White book
- Rockwool cladding roll.
Newcastle House: What happened with the services (electrical, fire alarm etc)?
The services re-located to accommodate new space by a fire engineer.
Newcastle House: What functional performance did the plasterboard on top of the stud give?
12.5mm Gyproc wall board onto the stud partition with wool insulation achieves:
- 30min fire protection
- Obtained minimum 42dB suitable for Part E Sound.
Newcastle House: Any license for alterations?
I would assume so yes, I wasn’t involved with this element.
Newcastle House: Describe the finished composition of the wall?
Timber stud uniformly distributed with noggins at regular centres and heights.
Mineral wool thermal insulation laid between for sound protection.
12.5mm plasterboard with taped joints and beaded corners.
Skim and paint finish.
Newcastle House: Why was a DPM required?
Prevent the timber stud from rotting due to the porous concrete floor.
Could have used treated timber though this was more expensive.
Newcastle House: Why were noggins required?
To prevent the vertical timbers bowing.
Newcastle House: Why was cheaper better in that case?
Both systems provided the same end result which was a more economical approach – could say this was value engineering.
Newcastle House: How would the metal system be more suitable if the works were more extensive?
Quicker installations results in decreased labour – over large projects this could prove to be more favourable/economical as
The studs can be cut with snips on site – no need to saw which could be a H/S positive too.
Less materials required and less work.
Newcastle House: How was the timber stud system more labour intensive?
DPM
Noggins
Had to be taken away and sawn the outside. Whereas metal could be cut internally with snips.
Newcastle House: What other occasions would the metal system be more favourable?
If there was no access to a saw or the works needed to be cleaner (for example food preparation units etc)
