How To Construct a Lean To Fashion Roof


Constructing A Lean To Roof For A New Screened Porch

By Clint Thomas

I dislike being scorching.  The older I get the extra illiberal that I’ve turn into of utmost warmth and nothing zaps your vitality greater than being in direct the solar for any extended time frame.  That’s why after I just lately constructed a porch on the again of a home that we personal I added a lean-to type roof and finally screened within the porch.  What higher means is there to spend a summer time afternoon than sitting within the shade on a screened-in porch consuming an ice chilly drink?  Along with the advantage of shade, the porch roof that I constructed additionally served the double goal of channeling water away from an inside nook on the again of the home.  As everyone knows, water is the primary enemy of a home.

The porch that I had constructed crammed in an L-shaped area on the again of the home that in any other case would have gone to waste.  This is the reason having a roof put in was so essential as a result of with out it water would have run off of the house’s principal roof and the roof of the small addition inflicting an extreme quantity to build up within the nook the place the addition related to the home.  Finally, this could have triggered a rot problem. To examine how we constructed the platform deck for this porch undertaking, click on right here.

Porch with out partitions or roof

With the porch having already been constructed, I had a simple platform to work off to start developing the 2 exterior partitions that had been required to carry up the roof.  Usually, a wall is constructed with 2×4’s spaced sixteen inches on heart.  Nevertheless, these partitions weren’t precisely load-bearing partitions since they had been solely supporting a roof and never one other ground.  Additionally, I didn’t wish to sit and have a look at a bunch of two×4’s after I sat on the porch.  Subsequently, after just a little trial and error, I made a decision to area the two×4’s thirty-two inches on heart.  I started this by laying out a 2x4x16′ and one other piece that measured 2x4x9′ that I used because the sections of the bottom plate.  I pre-marked on these plates the place every 2×4 stud would go.  That is performed by finding every sixteen inch interval which is definitely achieved by utilizing the information that comes on all tape measures.  For every sixteen foot interval, drop again 3/4″ of inch and place a mark.  That is the surface fringe of the two×4 that shall be put in.  For instance, on the sixteen inch mark on a tape measure drop again to fifteen 1/4″ and put your mark.  For the thirty-two inch measurement drop again to 31 1/4″ and put your mark.  This manner every 2×4 that you simply set up shall be precisely sixteen inches on heart.

Construct the partitions laying down

I then repeated the identical process for the highest plate utilizing one other 2x4x16′ and a 2x4x9′ part.  Remember the fact that a high plate shall be constructed by doubling collectively two 2×4’s and the extra inch and a half should be subtracted from the peak of the two×4 studs that make up the vertical body for the partitions.

The subsequent step was to put in every 2x4x8′ stud aligning every one with the marks that I had beforehand made.  I used my Paslode cordless framing nailer with 3″ framing nails to connect the studs to the highest and backside plates and a velocity sq. to maintain them sq. whereas they’re being nailed in place.  I extremely suggest a nail gun for this form of undertaking.  I personally don’t take care of lengthy cords or noisy air compressors which is why I opted for Paslode cordless nail weapons.  In framing the primary exterior wall, I needed to depart a thirty-eight inch tough opening to accommodate what is going to turn into a thirty-six huge display door.

Framing exterior wall

With the primary exterior wall framed, and with the assistance of  my pal, we lifted the wall up and stood it in place.  Certainly one of us held the wall so it wouldn’t fall over whereas the opposite one pounded  a wooded stake into the bottom.  A bit of 1×4 was then fixed to the stake within the floor with a screw and the opposite finish was held in opposition to the facet of one of many studs.  The 2 of us then every held a degree in opposition to the studs and adjusted for plumb and degree.  As soon as these had been achieved, the 1×4 that was screwed into the stake was additionally screwed in one of many studs within the wall to briefly assist it in place.

Exterior Wall Framing  


Assist board with stake as a brief assist

With the primary sixteen ft of wall held in place we then erected the remaining 9 ft adjoining to it to the entire the surface wall.  The 9 foot part was merely screwed into the bigger part and each sections had been then screwed into the deck itself utilizing deck screws after double-checking for plumb and degree.  The identical process was used to constructed the shorter fourteen foot lengthy facet wall which was screwed in place with deck screws.

Exterior Partitions

After all the vertical studs and the horizontal rails had been secured in place I then measured and reduce a bit of two×4′ materials to go between every of the vertical studs.  I fixed these in place with decking screws 30″ off of the ground to kind a handrail of types and likewise to enhance the general aesthetics of the wall.

As soon as each exterior partitions had been erected the subsequent step was to start the precise roof building.  This started by eradicating three rows of siding from the outside rear wall of the home and attaching a 2×10 strain handled ledger board.  This ledger board is what helps the roof rafters.  The Worldwide Residence Code 2015 requires that the ledger board be hooked up to the framing of the home and never instantly in opposition to the siding.  It additionally have to be correctly flashed to maintain water from intruding into the wall of the home rotting the house’s construction.  The ledger board is fixed to the home utilizing galvanized lag screws and corresponding washers that had been positioned in an alternating vertical sample.  You will need to pre-drill the holes for the lag screws after which use a top quality affect driver or an affect wrench with sockets made particularly for an affect wrench to lock the lag screws.  My 18 volt Makita affect driver did the job albeit with some effort.  My pal’s Snap-On cordless affect wrench effortlessly tightened every lag screw.

Ledger Board for roof

After attaching the ledger board to the wall I then pre-marked the situation of the place every rafter could be hooked up to each the ledger board and on the highest of the outside wall.  This makes it a lot simpler to get every rafter in its correct place thereby eliminating the chance of the roof body being out of sq..  I measured my ledger board from left to proper after which once more from proper to left inserting a small mark every time to see the place the strains for my rafters would fall.  I did this so I might not find yourself with a rafter finish in the very same location as the pinnacle of one of many lag screws.  In my case, I decided that it could work higher to start on the inside nook after which work to the surface nook.  This allowed me to overlook the vast majority of the lag screws and the few that I encountered had been offset sufficient that they didn’t intervene with the framing.

I used strain handled 2x6x16′ inventory that I reduce right down to 2x6x13 ‘ for every of the rafters.  My roof had a low pitch of solely 2:12 because of a protracted window overlooking the inside staircase.  I made a plum reduce on every finish of the rafter equivalent to the two:12 pitch of the roof.  That is simply achieved by utilizing the rafter information in your velocity sq..  A chicken’s mouth was additionally reduce to seat the rafter on high of the wall.  I reduce the primary rafter and after a few minor changes to make sure a comfortable match I used it as a template for the reaming rafters.  My pal and I held every rafter in place and toenailed it into the ledger board and the highest of the outside wall with my nail gun to briefly assist it.  The top adjoining the ledger board acquired a metallic joist hanger that was fixed to the ledger board and into the rafter utilizing 10d galvanized nails particularly made for that goal.  With a view to conform to the constructing code, I hooked up a hurricane strap to every rafter instantly over the chicken’s mouth reduce securing the outer fringe of the rafter to the highest of the outside wall.

Rafter information for frequent rafters on a velocity sq.       


Rafters with joist hanges hooked up


Nails & Screws


Hurricane straps

With the rafters secured in place, I constructed the cornice work consisting of a soffit made out of ” plywood and a strain handled 1×6″ fascia board.  For myself, it’s simpler to put in the cornice work parts earlier than the plywood decking is put in.  With assist from my pal, we held lengthy strips of plywood that had been barely wider that the soffit in place, and I scribed a line  on the finish of every rafter.  I did this by sitting on high of the rafters so I might have a chicken’s eye view.  My pal then related all the marks that I had made into one steady line and reduce this line with a round noticed.  My pal would then maintain each bit into place, and I might safe it in place with clamps till it was nailed.  We hooked up the fascia board by every holding one finish, permitting it to over grasp the soffit by one inch and inserting a degree on it earlier than nailing it.

Utilizing clamp to assist set up facia board


Soffit Installation
Soffit Set up


Installion of facia board & soffit
Installion of facia board & soffit

The subsequent step within the course of was to put the ” plywood decking on high of the rafters.  It’s best to start the primary row of plywood in opposition to the wall of the home after which work to the surface edge.  By doing this, the ultimate piece will greater than probably overhang the outside wall which makes it simpler to chop off.  Every bit of plywood I fixed down utilizing 2″ galvanized nails in my framing nailer.  I additionally secured the sides of the items of plywood collectively between the rafters with 20 gauge galvanized panel sheathing clips to assist assist them when somebody is strolling on the roof.

Plywood roof decking
Plywood roof decking


Plywood roof decking


Plywood Connector clips
Connector clips

I adopted the set up of the plywood decking with a layer of 20 pound roofing felt that I stapled in place.  I topped this of with a 29 gauge low-rib metallic roof ensuring to securely set up [email protected] formed flashing on the joint the place the roof decking connects with the outside wall of the home.  The L formed flashing was tall sufficient that it slid underneath the siding making for a watertight connection.  A row of sidewall flashing prolonged alongside the wall of the small addition the place it joins the roof deck.  When a roof has a  low pitch, something underneath 3:12, it is strongly recommended by most metallic roofing producers that butyl  tape be utilized on all lap seams to assist not sure a watertight seam.

Overlap 20 pound roofing felt as underlayment


Roofing felt put in


Installtion of metallic roof with butyl tape on the lap seams


Flashing on the roof to accommodate connection
Exterior wall flashing

When the solar is scorching and the bugs are biting, simply know that with just a little little bit of effort you and your loved ones can calm down within the shade underneath a ceiling fan and watch the day go by.  Screened in porches all the time remind me of my grandmother’s porch on summer time evenings when she would carry out the selfmade ice cream maker for all to take pleasure in with out the mosquitos.

Aspect view of completed roof
Sidewall of recent screened porch

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