ᐅ Poroton T9 unfilled or Poroton T8 with mineral wool insulation?
Created on: 23 Feb 2015 16:02
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fridolinmeier
Hello, my project will start this summer and I need to choose a masonry block now. The options are Poroton T9 unfilled and T8 filled with mineral wool (additional cost 2500 €). My question is (I have done some research already): Are the unfilled blocks really much more prone to cracking than the filled ones? I have looked at them, and the webs are definitely much thicker. The mineral wool is packed very tightly, so I hope it will only shrink a little over the years.
Thank you for your help.
Best regards
Fridel
Thank you for your help.
Best regards
Fridel
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fridolinmeier24 Feb 2015 22:24The structural engineer, shell builder, and excavation company have inspected the plot and have already worked on many houses in this new development area. They all gave a thumbs up, saying there is nothing more stable in this region. The groundwater is probably at 20 meters (65 feet) or deeper; the plot is situated higher up on the hill.
I’m facing exactly the same question right now and trying to figure out whether it makes sense to pay the extra cost for the T8-MW, which would allow me to skip the special plaster and full-area reinforcement required for the unfilled crumb stone T9, or to go with the T9 and cover those additional costs for plaster and reinforcement instead. Has anyone done the calculations on this? I especially lack prices for the special plaster and reinforcement compared to “normal” plaster that could be weighed against the extra cost of the blocks.
Best regards,
atlas1404
Best regards,
atlas1404
Häuslebau3r9 Mar 2015 13:10atlas1404 schrieb:
I’m currently facing exactly the same question and am struggling to decide whether it makes sense to pay the extra cost for the T8 lightweight concrete block, which would allow me to save on the special plaster and the full-surface reinforcement required for the unfilled crumb stone T9 blocks, or to go with the T9 and accept the additional costs for plaster and reinforcement. Has anyone done the calculations on this? In particular, I’m missing comparable prices for the special plaster and reinforcement versus regular plaster, so I could weigh these against the additional cost of the blocks.
Best regards,
AtlasYes, this is indeed a question that would be very interesting to answer. If we set aside the aspect of better insulation values for a moment, and since I’m not that far yet, it would be useful to directly compare these factors 1:1 when getting an offer.
Is the unfilled one not the U8?
What wall thickness are you planning to use @Annika90?
**Edit: I’m interested in a 49cm (19 inches) brick thickness.
I checked, for example, on Schlagmann’s website:
I don’t understand the pricing strategy at all. The perlite-filled bricks, which are supposed to be more stable, clearly cost less than the air-filled one? Who wouldn’t choose the perlite brick (whether T7 or T8)?
Image from schlagmann (.) de
What wall thickness are you planning to use @Annika90?
**Edit: I’m interested in a 49cm (19 inches) brick thickness.
I checked, for example, on Schlagmann’s website:
- T7 with a U-value of 0.14 (unit price according to Schlagmann about 8.5 EUR)
- T8 with a U-value of 0.16 (unit price according to Schlagmann about 8 EUR)
- U8 with a U-value of 0.16 (unit price according to Schlagmann about 13.3 EUR)
I don’t understand the pricing strategy at all. The perlite-filled bricks, which are supposed to be more stable, clearly cost less than the air-filled one? Who wouldn’t choose the perlite brick (whether T7 or T8)?
Image from schlagmann (.) de
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