Thorfun

ok, thanks. you and @PeterW have made me doubt myself so I've gone back to the plans from the waterproofing company and they have designed 2 x pumps, one internally and one externally in the sunken courtyard. I think where I'm getting confused is that the Civil engineers also wanted a pump in the external courtyard and so I requested that the civil engineer's pump and the waterproofing company's pump are amalgamated so we only have the one pump externally. but we still have a double sump pump internally in the plant room. sketch attached below. isn't that what the Powerwall 2 is for?

thank you for this! I hadn't thought about doing this DIY as it's not something I want to get wrong and I thought the quote for the waterproofing company to do it was 'reasonable'. plus it means that any issues they will have to get it sorted out. sometimes that piece of mind is priceless. but I will definitely keep the link and keep it all in mind if I need to make some potential savings.

interesting, no one has mentioned that as a possibility. I was trying to negate the need for 2 x sumps and pumps and also trying to remove the need to have a pump internally in the basement. I'll speak to them all about it. thanks for pointing out this possibility.

I also think @pocster is using the same type C waterproofing as well iirc. @pocster?

that's interesting. he seemed to imply that if there were issues it would come back to them.

the system designed is internal and so we wouldn't be using Type A (external tanking like yours) at all. we'd have Type B (waterproof concrete) and Type C (internal drainage). I'm a cynical person and I am concerned that the waterproofing company have suggested this route as there's more 'profit' in it for them but as I'm not an expert in all this and definitely don't want to have water ingress issues in the basement I have to go with what the experts suggest and are willing to sign off and guarantee. this is one area I don't want to skimp on financially but I also don't want to be taken for a ride!

thanks @Mr Punter. I'm not so worried about the reduction in floor space as the basement is pretty big! the only issue might be the plant room but I'll figure something out. sump and pumps have already been designed and as we have a sunken courtyard I've requested that we use a single pump in the courtyard to deal with the internal drainage and the sunken courtyard drainage as well. I need to have 2 forms of waterproofing and so the second form is a choice between tanking or waterproof concrete. the waterproofing company have designed waterproof concrete as the second form of protection so we'll probably just stick with that until I can compare costs for the waterproof concrete compared to the external tanking. I've read @Bitpipe's many posts on the subject and initially just wanted to copy him but the architects weren't happy with that solution and as they'd be responsible as principle designer and so got the design by the waterproof company. I have said to them though that if/when I speak to the groundworks companies they suggest Type A and Type B and will fully guarantee it then that will be ok for the architects. so we've a long way to go in our journey and things might change!

morning all, our architects as principle designers needed to consult with a waterproofing company to design our basement's waterproofing system and weren't happy with just waterproof concrete and external tanking unless it was signed off by them. the waterproofing company came back with the following: to be fair I don't really have a problem with the internal system I was just wondering if anyone had any comments, experiences, preferences, advice for this route of basement waterproofing?

welcome. the forum has a very useful search function where you can find a multitude of posts on Sunamp and ASHPs.

si señor!

as this is a Tesla/Apple-love-in thread, this arrived a short while ago.

I'd be upfront with the groundworks company that did the quote and ask them! they should be able to break it down for you. I'm very interested in the result if you do as I'm in a similar position in that I should be looking for quotes in the next couple of weeks for our basement and foundations.

as much as I enjoy the updates, haven't you got a bathroom or two that need finishing?

and that warm fuzzy feeling is worth more than any ROI or financial repayment period etc

I don't think it's sad! in fact I was going to ask about it today as it's nice and sunny down here in Sussex. looks like it'll be a good day for your battery charging today.

maybe if we don't put a kitchen in.....or bathrooms.....or heating.....or lighting..... let me run that by the wife and see what she says.

don't worry too much. it won't stop me from the path I'm looking to tread.

any idea if it's available for a 3-phase connection? that's my only concern at the moment. but yeah, it does seem like a good deal. especially with no standing charge as there's a high possibility that in the summer months you won't pay a single penny for electricity. ?

that's me! only 2 days until my new phone arrives. ?

yep. as MJNewton said, MVHR is not a heating/dhw system! although it can be used for a bit of heating/cooling (from the reading I've done on here a few have a system that does a little heating/cooling) it is no substitute for a gas boiler or ASHP as a primary heating/dhw supplier. take a read through the MVHR forum and ASHP forums for load more information on both subjects.

I think he means Octopus can draw from the battery and cycle it as they see fit. every time I press the wipers to clean the screen an image is sent back to base so they can use AI to adjust the algorithm to make the software work better. I love it! my car just keeps getting better over time.

true

very good point well made. like I said, for me, SolarWatt is still a consideration but Tesla is still at the top of the list. I think I read about a Tesla tariff (I think Octopus) where with an EV, PV and PW2 you can import and export at 8p and not have a standing charge. that will also play a factor if that's possible as not having a standing charge is definitely a bonus as well as being able to buy electricity if required at the same cost we're paid for exporting it. once again, I'm about 4 months at least away from buying this stuff so it could all change and I will be doing a LOT more research on the whole thing.

that's an interesting spike at 8am? what comes on at that time? ASHP? Kettle? Hydroponics setup?

not at all. I tend to use man-maths which means I can work the numbers to get the result I want every single time.?