How much western blockout is enough?

Okay - one slight hiccup on my house plan/build. The external shade blind for our very large western window (back of the house, living area) doesn't quite stretch sideways far enough - great until around now, when the sun is moving further south and peaks around the edge.

I don't want to put on internal blinds/curtains and clutter up the inside, and/or cover the louvre windows, so am looking at installing an external fixed screen in the next structural bay over from the pull down screen ... something like this ... there is no real view out that direction.

Deisgn Flow - Lattice and pickets - fencing design Melbourne

So question in - for the western sun - would you go 59 or 72% blockout?

 

Oh, I though this was another China thread...

 

What sort of glazing have you got there? Do you have the shgc of the window? That will determine how much you need to screen it too

 

Low-e glass ... so very good at keeping inside cool and warm - until hit directly by that westerly sun

low-e glass types and benefits of a low-e coating on glass

 

All quiet on the Western Front?

 

I would go 65% by adding some holes to the 59% screen

 

I think I'd go over 70%

 

At least 72%

 

Though stopping the sun hitting the external surface of the glass is the most effective way of reducing heat load

 

Have you considered tinting? My son’s bedroom faces west and even though it’s shadowed by the carport most of the day it gets really hot, maybe from pavers etc heating up. I’m not sure what products are available and how effective they are for reducing heat but as a quick fix we tried a frosted sticker product and application spray from Bunnings just on one window and it’s cooler. The bottoms of the windows are already tinted in a see through tint from previous owner.
Window Film - Bunnings Australia

 

I like bloom, bubbles and love cubes. Don't like magnolia as much - maybe because it looks heavier. But I like them all and my initial thought was to go for higher block out.
Trees are not a possibility? A cluster of glauca ie pencil pine or callistemon?

 

I'm leaning towards the 72% ... they are only $135 plus self install - so if it doesn't work, then not the end of the world and I'll find somewhere else in the garden to put it

 

I've got two dwarf apples and a couple of table grape vines in the garden bed, a metre below the window - but neither will grow high enough to block the sun at it's arching zenith - and I don't want all year shade so that rules out a lot

 

Remember you will also be blocking light in winter if it is a fixed screen.

 

No particular view - just rooftops with some glorious sunsets

I like the adjustable shade, so we can get the winter sun in, but the other panel is to high to reach. Another issue with the shade is that, when we get the roaring westerly winds, it does give the sprung cloth havoc.

Photo below - show the shade down - and the right hand side is where we want to fill. Hubby put some vertical panels in today, to see if they would work - and nup. The mesh below the space is where the grape will eventually climb up for summer shade, and you can also see the juvenile apple trees under the window

 

Mine grow 3 metres or so high. They end up on the roof. Maybe you could try to buy a mature one? I meant to pot up and sell half of mine over winter.

 

Looks gorgeous! That is the result I'm hoping for ... atm they're twiddling their thumbs and not doing anything much ... planted this year and getting used to the soils/location

 

Yes these could be up to 35 years old so the main trunk is about 2m high. We gave them a big trim about 18 months ago. Of course if it was me I’d have a large frangipani in a large pot on my patio to solve my problems for a few years!