Do-it-yourself sandwich chimney: assembly instructions, installation, price

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sandwich chimney in a private house

The sand­wich chim­ney is a two-cir­cuit struc­ture made of stain­less steel, in which there is a heater between the two pipes, exter­nal and inter­nal. Non-com­bustible, envi­ron­men­tal­ly friend­ly mate­r­i­al is used as a heater.

In anoth­er way, a sand­wich chim­ney is an insu­lat­ed chim­ney. This design is used wide­ly and every­where: for fire­places, stoves, ven­ti­la­tion sys­tems and where the device of the inter­nal struc­ture can­not be used. Con­sid­er how to prop­er­ly install a sand­wich chim­ney with your own hands.

Features of sandwich chimneys

A three-lay­er chim­ney, like any oth­er device, has a num­ber of fea­tures that dis­tin­guish it from oth­er sim­i­lar designs. First, con­sid­er the advan­tages and dis­ad­van­tages of the design.

elements of chimneys with insulation

Advantages and disadvantages

Advan­tages Flaws
Name Char­ac­ter­is­tic Name Char­ac­ter­is­tic
Ease and avail­abil­i­ty of instal­la­tion Instal­la­tion of a sand­wich chim­ney is sim­ple and afford­able, unlike the same devices that require con­trol by a spe­cial­ist Short ser­vice life The ser­vice life of sand­wich devices is about 10 — 15 years, while con­ven­tion­al pipes can last much longer, sev­er­al decades.
Ver­sa­til­i­ty The chim­ney sand­wich pipe can be pulled up and to the sides, that is, into the walls, which makes it pos­si­ble to choose when con­fig­ur­ing Rapid loss of tight­ness Due to tem­per­a­ture changes, the sec­tions are con­stant­ly nar­row­ing and expand­ing, as a result of which its tight­ness is reduced.
Has high qual­i­ty insu­la­tion Due to which the device has low heat loss and high per­for­mance High price Qual­i­ty items and parts have a high price
Safe­ty It is safe for humans to use such a design, since the exter­nal cir­cuit heats up to cer­tain val­ues ​​​​and is not capa­ble of harm­ing and caus­ing burns.
Lay­er­ing Does not allow con­den­sa­tion, a large amount of soot to appear

As we can see, the dis­ad­van­tages of such a design are much less than the advan­tages, which great­ly dis­tin­guish­es it from its coun­ter­parts. Thus, the insu­lat­ed sand­wich struc­ture on the out­side allows for rapid heat­ing of the inner pipe, result­ing in a con­stant nat­ur­al draft, and com­bus­tion prod­ucts are imme­di­ate­ly removed to the out­side. In addi­tion, they have a high stan­dard of safe­ty and reli­a­bil­i­ty, are resis­tant even to sud­den changes in tem­per­a­ture and have a low lev­el of con­den­sa­tion.

SNiP 21–01-97 and technical characteristics of the basalt thermal insulator

When installing a sand­wich chim­ney, it is impor­tant to study the tech­ni­cal char­ac­ter­is­tics of the basalt ther­mal insu­la­tion lay­er, that is, the thick­ness of the con­tents. Its mean­ing can vary from 2.5 to 6 cm.DIY sandwich chimney

The cross sec­tion of the device can also be dif­fer­ent and it depends on the pow­er, anoth­er indi­ca­tor that should be tak­en into account when installing in accor­dance with build­ing codes and reg­u­la­tions.

Pow­er rat­ing N (kW) Sec­tion val­ue (mm)
Less than N 3.5 140*140
3.5 N 5.2 200*140
5.27 270*140

Table — The ratio of pow­er and cross sec­tion

Dur­ing instal­la­tion on their own, prod­ucts of round sec­tion are main­ly used. In such sit­u­a­tions, first of all, the cross-sec­tion­al area is cal­cu­lat­ed accord­ing to the rules of SNiP 21–01-97, and only then the nec­es­sary prod­ucts are select­ed that have cer­tain indi­ca­tors.

What should you pay attention to when choosing a design?

When choos­ing a chim­ney pipe already from fin­ished prod­ucts, you should pay atten­tion to sev­er­al main fac­tors:

  • it is impor­tant that it pro­vides nor­mal trac­tion;
  • the chim­ney must not be clogged;
  • the device must be cor­rect­ly installed;
  • the design must meet the require­ments of safe­ty, com­fort.

At the same time, the price when buy­ing parts and ele­ments should not be a deter­min­ing fac­tor.

Preliminary calculation of the chimney and installation diagram

Instal­la­tion of a sand­wich struc­ture should take place after pre­lim­i­nary cal­cu­la­tions, among which it is impor­tant to deter­mine not only the cross-sec­tion­al indi­ca­tors, but also the length and its loca­tion.

Chimney height and location on the roof

Roof chimney exit method

When deter­min­ing the loca­tion in which it should be locat­ed, it is impor­tant to take into account the fol­low­ing:

  1. In a sit­u­a­tion where the house has a flat roof, the sand­wich struc­ture should be placed at least half a meter (0.5 m) above the roof.
  2. When the dis­tance between the out­let and the roof ridge is less than half a meter (1.5 m), then the chim­ney should be installed half a meter above the ridge.
  3. If the dis­tance between the chim­ney and the ridge falls in the range from one and a half to three meters, then the height should be made equal to the height of the ridge.
  4. When the above dis­tance is more than three meters, then the height of the chim­ney is based on the prin­ci­ple of an imag­i­nary line, which it should be equal to. An imag­i­nary line, in turn, is drawn from the ridge to the hori­zon at an angle of 10 degrees.

When cal­cu­lat­ing the length, it is impor­tant to con­sid­er a few basic rules:



  1. Accord­ing to build­ing codes sand­wich the sys­tem must have height not less than 5 m.
  2. When using a mate­r­i­al with a high degree of com­bus­tion as a roof cov­er­ing, chim­ney sand­wich over ridge roof worth an extra boost about 1 — 1.5 m.
  3. When using non-com­bustible mate­r­i­al on the roof, the same height must be at least half a meter.
  4. If the house has exten­sions on the roof and they are high­er than the house itself, then the struc­ture must be installed so that it is high­er than such a build­ing.

Scheme of installation of a sandwich chimney

In order to make it eas­i­er to imag­ine how it is worth doing the instal­la­tion cor­rect­ly, we present a dia­gram.

the correct design scheme for installing sandwich pipes in a house

Fig­ure — Mount­ing scheme

Thus, if all the require­ments and rules are tak­en into account when cal­cu­lat­ing the loca­tion of the sand­wich chim­ney, its height and length, then the instal­la­tion will be per­formed cor­rect­ly.

DIY installation instructions

Required parts, fasteners and tools

Before start­ing the instal­la­tion of a chim­ney sand­wich struc­ture on your own, it is worth prepar­ing some fix­tures and parts. These include:do-it-yourself installation of sandwich pipes

  • a spe­cial adapter that will allow you to bring the device to the roof;
  • con­sole (brack­et) for fix­ing the sand­wich struc­ture;
  • plat­form for unload­ing, thanks to which it will be pos­si­ble to even­ly dis­trib­ute the weight and there­by remove the load from the base;
  • a kind of hole (win­dow), through which the chim­ney will sub­se­quent­ly be cleaned;
  • clamps for fix­ing struc­tur­al ele­ments;
  • sev­er­al adapters;
  • a knee at an angle of 90 or 45 degrees, it will allow you to change the direc­tion of the chim­ney sand­wich;
  • device for the upper part — cone, fun­gus, wob­bler, etc.

Before pro­ceed­ing with the instal­la­tion, you should find out how and in what way the ele­ments can be con­nect­ed. There are sev­er­al such meth­ods:

  1. flanged. Such a con­nec­tion allows smoke to escape through the pipe with­out obsta­cles due to excel­lent trac­tion, but with poor­ly closed joints, mois­ture can seep into the struc­ture and dam­age the basalt insu­la­tion.
  2. con­den­sate. This method is used when it is nec­es­sary that con­densed mois­ture, which occurs due to tem­per­a­ture dif­fer­ences, flow freely along the walls. With this instal­la­tion, the inner tube is placed in a sock­et so that mois­ture does not pen­e­trate inside, but at the slight­est gap, smoke will enter the room.
  3. bay­o­net or bay­o­net. Such a con­nec­tion of parts is obtained as a result of move­ment along the axis and rota­tion, and some­times lat­er­al dis­place­ment, of one part rel­a­tive to the oth­er.
  4. smoke. Sand­wich con­struc­tion is assem­bled accord­ing to this method in the case when it is nec­es­sary that car­bon monox­ide does not pen­e­trate into the house.

When choos­ing any of the options for con­nect­ing the chim­ney pipe, it is impor­tant that all the cracks are care­ful­ly closed, then mois­ture can­not dam­age the insu­la­tion, and flue gas­es will not dam­age the health of the house­hold. In addi­tion, it is rec­om­mend­ed to install the inter­nal pipes of the struc­ture along the con­den­sate so that mois­ture does not enter the joints and does not leak.

After prepar­ing the nec­es­sary parts and choos­ing a con­nec­tion method, you can pro­ceed direct­ly to the assem­bly. Instal­la­tion of the struc­ture does not require spe­cial or addi­tion­al skills and abil­i­ties. It can be per­formed even by a per­son who is far from con­struc­tion.

The main rule to remem­ber before start­ing the assem­bly is that the instal­la­tion should start from the bot­tom, i.e. from the boil­er, and con­tin­ue towards the roof. The instal­la­tion can be divid­ed into four main stages.

Assembly of stainless steel chimney elements

Stage 1 — assem­bly of parts.

Con­nect­ing the parts togeth­er is quite sim­ple, the main thing is to be care­ful. First of all, what you need to pay atten­tion to is that one end of the pipe has a small radius, and the oth­er is slight­ly larg­er. In order to prop­er­ly con­nect the parts, you need to push the end with a small­er radius into a larg­er one.

This assem­bly has many advan­tages:roof sandwich chimney assembly

  • soot will not accu­mu­late;
  • mois­ture will be eas­i­ly removed.

How­ev­er, to ensure that con­den­sate and mois­ture actu­al­ly come out, and do not set­tle inside the device, it is nec­es­sary to insert tees.

Stage 2 — the with­draw­al of the chim­ney.

Sand­wich pipe on the street can be removed in two ways:

  1. Through the wall
  2. Through the roof

We will con­sid­er each of the options a lit­tle lat­er.

Stage 3 — fix­ing the chim­ney.

Stage 4 — com­ple­tion of work.

Mounting through the wall

installation of sandwich pipes with a passage through the floors of the house

Let’s return to the sec­ond stage and con­sid­er ways to remove the chim­ney struc­ture. When installing an insu­lat­ed chim­ney through a wall, the fol­low­ing steps should be tak­en:

  1. When remov­ing a sand­wich pipe through a wall, the first step will be to dis­as­sem­ble the entire struc­ture and fix the land­ing brack­ets (props).
  2. Install the out­er con­sole and attach a cou­ple of cor­ners to them in such a way that the shape of the “run­ners” is obtained. They will allow you to move the tee in the process of work with­out obsta­cles.
  3. Close the wall with a 1 cm sheet of ply­wood and fix fine-fiber asbestos mate­r­i­al on top of it with screws.
  4. On top of the asbestos, one gal­va­nized sheet with para­me­ters 12 * 20 cm should be installed.
  5. Next, a square hole must be made in the sheet through which the pipe will go out, the sheet itself should be well fixed with screws.
  6. After instal­la­tion, the sup­port must be var­nished with an anti-cor­ro­sion effect.
  7. An adapter is insert­ed into the hole in the wall, in which a hole is also made, and then a pipe is put on.

When installing the chim­ney pipe through the wall, remem­ber about the con­ces­sion. A con­ces­sion, or retreat, is a space that is nec­es­sar­i­ly left between the wall and the pipe. The val­ue of the con­ces­sion depends on the wall thick­ness of the chim­ney (fur­nace).

Table — Basic assign­ment para­me­ters

Wall thick­ness of the chim­ney (fur­nace) (cm) assign­ment type Dis­tance from the sur­face of the chim­ney (fur­nace) to the wall (cm)
flame­proof (non-com­bustible mate­r­i­al) not pro­tect­ed from fire (com­bustible mate­r­i­al)
12 open twen­ty 26
12 Closed 26 32
6.5 open 26 32
6.5 Closed 38 fifty

When mount­ing through a wall, it is impor­tant to cor­rect­ly install the first ele­ment of the entire struc­ture so that the first part is attached to the sec­ond above the lev­el of cut­ting the ceil­ing. Such an instal­la­tion will allow visu­al con­trol of fire haz­ardous ele­ments.

Installation through the roof

insulated chimney installation on the roofTo bring the insu­lat­ed chim­ney through the roof, do the fol­low­ing:

  1. A sheet of steel is applied to the exit hole from the inside.
  2. The chim­ney is led out through the roof.
  3. The sheet is fixed to the roof with screws.
  4. If nec­es­sary, it can be brought under the edge.

If the roof of the house is made of com­bustible mate­r­i­al, then it should be addi­tion­al­ly pro­tect­ed from pos­si­ble igni­tion. To do this, the deflec­tor itself should be equipped not with a cone or fun­gus, but with a spark arrester.

The con­clu­sion of the struc­ture on the roof is the most dif­fi­cult and with this method of instal­la­tion, one more detail will be required — roof cut­ting. This is a spe­cial met­al struc­ture that pre­vents the walls of the chim­ney from com­ing into con­tact with the roof­ing mate­ri­als.

Mounting Features

When fix­ing the struc­ture and its con­stituent ele­ments, some fea­tures should be tak­en into account:

  • all parts and knees are con­nect­ed and fas­tened togeth­er with clamps;
  • the tee should be addi­tion­al­ly fixed with brack­ets;
  • if the top of the struc­ture is not fixed, then for safe­ty it should be fixed with stretch marks;
  • dock­ing ele­ments must be addi­tion­al­ly fixed and fixed to each oth­er with clamps, and with oth­er parts, for exam­ple, with an adapter, clamps on both sides.

How to insulate and seal the chimney from the outside

Fea­tures of the final stage:completion of installation of a two-layer chimney

  • After all the instal­la­tion and fas­ten­ing work comes to an end, it is worth remov­ing the pro­tec­tive film.
  • It is impor­tant to check whether all slots and joints are well sealed. It is bet­ter to seal with a flame retar­dant sealant that can with­stand very high tem­per­a­tures, at least 1000 0FROM.

In this case, the sealant must be applied, tak­ing into account some of the nuances:

  • if it is applied to the inner pipes, then they cov­er the entire area of ​​u200bu200bthe out­er sur­face of the upper ele­ment;
  • if on exter­nal ones, then it is applied accord­ing to the same prin­ci­ple (see above);
  • if at the point of tran­si­tion from a con­ven­tion­al pipe to a sand­wich, then they should seal the entire area from the out­side around the cir­cum­fer­ence;
  • if at the junc­tion of an ordi­nary pipe and oth­er ele­ments, then also on the entire area from the out­side along the cir­cum­fer­ence.
  1. The most dan­ger­ous areas of the chim­ney should be checked for tem­per­a­ture.
  2. Do not for­get to take a place for the inspec­tion win­dow so that there are no dif­fi­cul­ties dur­ing inspec­tion and clean­ing.
  3. The cor­rect length of the struc­ture in the end should be approx­i­mate­ly 6 m, count­ing from the grate.

Cleaning and maintenance of the chimney

It is a plea­sure to use the results of your labors, espe­cial­ly if you installed the chim­ney cor­rect­ly.

How­ev­er, care is equal­ly impor­tant. Usu­al­ly, dur­ing the use of the device, soot accu­mu­lates in the pipe, which not only reduces the use­ful sec­tion, but can also cause a fire.

It is nec­es­sary to reg­u­lar­ly clean the sand­wich chim­ney, espe­cial­ly dur­ing the heat­ing sea­son, at least twice.

For this impor­tant mat­ter, a spe­cial inspec­tion win­dow was pro­vid­ed dur­ing instal­la­tion, which will allow you to clean the pipe with­out much has­sle.

Prices and sizes of stainless steel components

The cost of sand­wich pipes for chim­neys is dif­fer­ent and depends on sev­er­al fac­tors:

  1. diam­e­ter of the inner pipe;
  2. qual­i­ty of ther­mal insu­la­tion mate­r­i­al;
  3. ther­mal insu­la­tion thick­ness;
  4. pipe thick­ness;
  5. mod­ule length, etc.

When installing a sand­wich chim­ney your­self, you should take into account many fea­tures and rules, the exact imple­men­ta­tion of which will allow you to not only install the chim­ney cor­rect­ly, but also safe­ly.

  • The aver­age price for one sand­wich pipe mod­ule is from 500 to 4000 thou­sand rubles.
  • Short sand­wich pipes 0.25 m and not large thick­ness can be bought with­in 500 — 6 dol­lars (we are talk­ing about one ele­ment).
  • Pipes about 1 m long will cost more 2000 — 3500 thou­sand rubles.

It is also impor­tant to choose the right chim­ney, for this you can read the char­ac­ter­is­tics, con­sult with experts, study the instal­la­tion mas­ter class­es. In gen­er­al, if you have instal­la­tion instruc­tions and dia­grams at hand, the nec­es­sary tools and parts, then you can do the instal­la­tion of the chim­ney pipe with your own hands with­out much cost and has­sle.


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