Do i need to add new drainage? - Removed patio for new decking

[Jeremy]

Hi all,

I'm in need of some advice, I have recently removed an old conservatory and concrete patio from the rear of the house.
The patio etc extended 3.5m from the house and was approx 9.6m in length, it was angled and drained onto the lawn.
The plan is to build a decking platform from a ledger bolted to the house and extended approx 2.5 metres (we are reclaiming the further metre and seeding for lawn.
The question is now the site is level do I need to worry about water draining through the deck and collecting against the house and foundations? The soil has a high clay content and drainage has never been a problem before. I do have two existing surface water drains (one each end of the house) but these are now above gound level. Should I install some linear drainage along the length of the house and drain into the existing SW traps? or am i creating extra work for the sake of it?

I have also had to lower the main drain manhole by one course of block but having read bits on this site have no problems with refixing at new level.


great site folks.

[Jeremy]

14 views and no pearls of wisdom......?

here's a piccy which might help you understand what I'm talking about

[Tony McC]

The Oyster is here!

If there's a risk of water hanging beneath the <spit>deck or aginst the house walls, then you ought to provide some form of drainage. My preferred option would be to trim and form the sub-grade to a dished profile, with a simple yard gully as the focus of the dish, cover the lot with a permeable geo-tile or even a crappy landscape fabric and top-dress it with a cheap gravel to make it look presentable and keep down the weeds.

Simpler and cheaper than linear channels, I reckon!