Thanks for the update... Correct me if I am wrong but looking at the renders again, I dont see any black panels?
I don’t think there are any on the renders, just black window frames. Is the black area a protective film? It doesn’t look smooth enough to be the finished article.Thanks for the update... Correct me if I am wrong but looking at the renders again, I dont see any black panels?
Curiosity got the better of me. I should never have doubted mulkanator's photo! The spandrel panels were going to be of laminated glass but the developers are contracted to meet NHBC standards to get a warranty. NHBC don't accept laminated glass for anything other than windows, so they've settled for powder coated aluminium (colour - anthracite) instead.Thanks for the update... Correct me if I am wrong but looking at the renders again, I dont see any black panels?
The elevations at Castle Park View include spandrel panels at slab edges, adjacent to windows and at the corner elements. The original intent was for these panels to be back painted (fritted) panes of glass as approved and discharged through planning condition 3. However, with the NHBCs refusal to accept laminated glass for these elements under their warranty and the subsequent impact testing failure of an alternative heat strengthened glass we have exhausted all the options to find a technically viable and safe glazed solution.
We discussed various alternative materials such as timber and render which had the potential to be incorporated into the façade system but were deemed inappropriate and would prove detrimental to the high quality design. Another material that could be accommodated into the already evolved cladding system was PPC aluminium – it was agreed this will provide the closest match to the original design intent in terms of profile and texture.
With this opportunity to revisit the elevational material treatment we explored the use of various colours and finishes of PPC aluminium ‐ from bold primary colours to multiple grey tones, solid matt finishes and reflective gloss finishes. Whilst bold colours did provide an initial positive reaction, it was agreed that such colour does not stand the test of time and can quickly date ‐ with such an iconic building for Bristol we would be unwise to move away from our original intent of a long lasting high quality design. It was concluded that an anthracite/ slate metal spandrel would provide a contrast in depth to the window frames. This tone compliments the neutral palette of other materials of stone and brick and maintains the shifting checkerboard elevation which has become a defining feature of the scheme when viewed from around the city. Something that is lost through this proposal is the reflectivity of the environment – only made possible due to the unique properties of glass. We wanted to explore the potential of recreating this effect in a metal spandrel and looked at a range of gloss finishes. Whilst a high gloss finish did reflect the light at certain angles there wasn’t a consistency, with certain angles producing a shiny glare which would not translate well onto the elevation – ultimately reducing the quality of the design. Advice from our façade consultant also suggested a high gloss finish would be much more likely to highlight any imperfections in the metal – something which quickly became apparent once samples were received. Following this and sticking with our intent of a long lasting, high quality design it was determined a matt finish would be the best treatment and provide a consistency and quality that can be maintained over time.
A matt finish anthracite metal spandrel has proven the best option to replace the fritted glass at Castle Park View. By not overpowering the other façade materials of stone and brick it maintains the expressed external frame and shifting ‘checkerboard’ effect across the elevations.