I’m building a deck out the backyard and i have an issue with trying to make my decking boards level to the back sliding door but there’s a brick sill in the way which I don’t want to remove so I was wondering if there’s a way I can justify the situation without having to demolish the brick work.
The thickness of the decking boards are 35mm. Thanks
The issue I presume you're experiencing at the moment is that when you add the 35mm thick timber on top of your frame, it's higher than the door frame. 19mm decking timber would transition much better. I've created the renderings below to illustrate. You'll likely need to use plastic wedges to offset the angle of the door threshold bricks. You could still use the 35mm hardwood, but your deck will be slightly above the height of the door frame.
Bear in mind that typically you don't want a deck to be level with a doorframe, as in a storm, the water on the deck will be blown off the deck and into the door frame.