Which fixings for treated timber to masonry

[mg123]

I'm building a lean to pergola type thingy.
Size wize, it's probably a little overkill, but i like the look of larger timbers.
I have 8 x 2 treated timbers and plan to add polycarbonate roofing sheets to provide some rain cover.
It will be approx 3.6m width (braced to the house) by 2.6m length.
I'm wondering which would be the best fixings to anchor to the house?
It'll be attached to my extension, which is made of medium density concrete blocks. The height will be around 2.6 metres. I'm yet to decide how many rafters I will use, but I have enough timbers for 10 of them so plenty if needed.
Would concrete screws suffice for fixing to the building, 7.5 x 150mm? Or is a better option one of the many thunderbolt type of fixings or maybe even resin anchors. I'm very aware of the recent strong winds, so I don't want to have any risks. Maybe I'm over thinking things.
Also, currently I only have two 4x4 posts, concreted around 2 feet into the ground, to support the roof at the opposite end of the house, but I think an extra one might also be advisable.

Any thoughts or advice is greatly appreciated.

 

[Bingy man]

Personally I think 8”x 2” is just too much , the weight of these will imo mean the fixings will not only have to cope any load you add but the weight of the 8 x 2 .themselves. 4”x 2 should be more than enough - fixings wise anchor bolts , or as you say resin anchors . I’m not sure how much torque the medium density blocks will take . I think a 3 support post is a good call as although poly carb sheets aren’t heavy add 2 ft of snow and ice into the mix and it’s another story. Good luck

 

[Orraloon]

If you like the 8x2 stick with it. I did because to my thinking 4x2 looked too spindley and on a longish span will be too small anyhow. Be a good idea to read up on your building regs to get spans and sizing, spacing and construction methods like what size bolts, fixings and notchings for beams and posts. As you say you dont want it blowing away so better going big than going small. For instance all the bolts in mine are 12mm gal. An open beam pergola is pretty simple construction but when you sheet over it windage and snow loading changes the requirements a lot. I can not advise on fixing to concrete blocks but I dont think brick screws will be enough. Building regs should have an answer.
Regards
John