Green Your Roof Green

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This guide tinyurl.com/l9tdbvBuilding Green reenYour Roof – A free guide to doing it yourselfwww.building-green.org.uk

1 Start with a shed2 Strengthen the shedAssemble your materials:Use battens (here shown as the darker coloured crosspieces on the sides) to strengthen the shed. This is toenable it to take the extra weight of the roof and stop ittwisting.- Bog standard flat pack shed. This one cost about 100. Various lengths of timber. Mine were from a woodrecycling project and cost about 10.- Butyl pond liner for waterproofing - you can get this at agarden centre. Enough to cover the roof area comfortablyand go over the edging boards. About 15 for 1x1.5m.- Gardening fleece to cover roof area x 2. A few quid. Growing medium ('substrate'). Mix your own using perliteand/or vermiculite and compost; or buy a ready madegreen roof mix. The key is to reduce weight.For examples of green roofs on different shed types, visitour website. You can do a shed roof at any time of year,but late winter/early spring is a good time.3 Strengthen it some more4 Strengthen yourselfExtra joists screwed in to support the weight of thesubstrate on the roof deck.Be strong. Drink tea. Prepare yourself.Green Your Roof – A free guide to doing it yourselfwww.building-green.org.uk

5 Sand all timbers6 Fix arris rail and facia boardMake sure you sand all timbers used for the roof tominimise the risk of splinters causing leaks.- Nail or screw the facia board (the flat one at the front)to the ends of the roof joists.- Screw arris rail (the curved wood - could be triangular,doesn't matter) to the facia and the roof.- Screw to short uprights the same height as the sideboards you will fit.- Determine the height of the side boards by the depthof substrate you want. Deeper substrate will allow amore varied range of plants to grow - but will be heavier.At least 80-150mm deep substrate is recommended.7 Another view.8 Fit spacers.of the facia board fixing.In this design, excess water will run over a hidden facia,behind the main facia board. Spacers are used toseparate the two facias. Use three of four spacers likethis.Green Your Roof – A free guide to doing it yourselfwww.building-green.org.uk

9 Fix side boards10 The back boardShowing the back board fixed. It is screwed to the roofjoists, and the short upright pieces joined to the sideboards.These boards (white in this picture) make up the sidesand back of the green roof. I used old skirting boards slightly thicker boards would have been stronger, butheavier. They determine the depth of substrate you willhave.11 Fit a batten12 A layer of fleeceThe batten (pale cross-piece) helps stop the substrateslipping down the sloping roof. Nail or screw it to the sideboards.A layer of fleece helps guarantee against sharp edgespuncturing the liner.Green Your Roof – A free guide to doing it yourselfLeave over a foot-wide strip and save for later.www.building-green.org.uk

13 The butyl liner14 More fleece, and substrateFit the butyl pond liner in place - don't nail it! Or trim ityet.Another layer of fleece, and you can put the substrate in.BUT FIRST, put a deep layer of vermiculite (blown clay) atthe front to help with drainage.Use a local child, if you have one!15 Drainage detail16 Fix the front edge of the linerFold over the excess liner at the front, and fix behind thespacers you screwed on earlier. This is the lip that excesswater will drain over.Get the cut off strip of fleece, and put over thevermiculite. Push substrate on top.Green Your Roof – A free guide to doing it yourselfwww.building-green.org.uk

17 Fix the second facia18 Select plants or seedsA wide range of plants can be used on a roof, or youcould let it colonise naturally. When choosing what togrow, things to think about include:Screw your finishing facia onto the spacers, using boardthe same width as the side and back pieces.- depth and type of substrate used- amount of sun and/or wind exposure- plants which tolerate dry conditions. Watering your roofregularly isn't very sustainable!- plants which attract wildlife and flower through as muchof the year as possible.This roof is in the shade all day, so I used lungwort, arange of sedums and I'll see what happens. I plan to gethold of some woodland plants for next year.Planting ideas and resources are available at theBuilding Green website.19 Overview of the green shed roofEdging strips hide the liner and neaten up the roofappearance. Hiding the liner also helps is last longer less sun, and exposure to sharp objects.It's good to mound up the substrate in places, and usestones and wood to vary the habitat. This means therewill be more plant variety and more wildlife - and it looksmore interesting.This picture shows the roof straight after planting - it willfill in as the plants get established. I plan to take a seriesof these over the months to see how the plants establish.This guide was written and produced by James Farrell, Chair, Brighton & Hove Building Green.Contact: info@building-green.org.ukGreen Your Roof – A free guide to doing it yourselfwww.building-green.org.uk

garden centre. Enough to cover the roof area comfortably and go over the edging boards. About 15 for 1x1.5m. - Gardening fleece to cover roof area x 2. A few quid. - Growing medium ('substrate'). Mix your own using perlite and/or vermiculite and compost; or buy a ready made green roof mix. The key is to reduce weight.

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